all solution from the latest build failed build on my Visual Studio 2017 #5694

I am getting the following build errors/warnings:

C:\Users\olawoyin\.nuget\packages\netstandard.library\2.0.3\build\netstandard2.0\ref\System.Collections.dll' and 'C:\Users\olawoyin\.nuget\packages\system.collections\4.3.0\ref\netstandard1.3\System.Collections.dll'. Remove one of the duplicate references.
1>CSC : error CS1703: Multiple assemblies with equivalent identity have been imported: 'C:\Users\olawoyin\.nuget\packages\netstandard.library\2.0.3\build\netstandard2.0\ref\System.Collections.Concurrent.dll' and 'C:\Users\olawoyin\.nuget\packages\system.collections.concurrent\4.3.0\ref\netstandard1.3\System.Collections.Concurrent.dll'. Remove one of the duplicate references.
1>C:\Users\olawoyin\AppData\Local\Temp\.NETStandard,Version=v2.0.AssemblyAttributes.cs(4,46,4,70): error CS0433: The type 'TargetFrameworkAttribute' exists in both 'System.Runtime, Version=4.1.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' and 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'
1>obj\Debug\netstandard2.0\AspenTechnology.EngArchAndCompDemo.Core.Shared.AssemblyInfo.cs(14,30,14,54): error CS0433: The type 'AssemblyCompanyAttribute' exists in both 'System.Runtime, Version=4.1.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' and 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'
1>obj\Debug\netstandard2.0\AspenTechnology.EngArchAndCompDemo.Core.Shared.AssemblyInfo.cs(15,30,15,60): error CS0433: The type 'AssemblyConfigurationAttribute' exists in both 'System.Runtime, Version=4.1.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' and 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'
1>obj\Debug\netstandard2.0\AspenTechnology.EngArchAndCompDemo.Core.Shared.AssemblyInfo.cs(16,30,16,58): error CS0433: The type 'AssemblyDescriptionAttribute' exists in both 'System.Runtime, Version=4.1.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' and 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'
1>obj\Debug\netstandard2.0\AspenTechnology.EngArchAndCompDemo.Core.Shared.AssemblyInfo.cs(17,30,17,58): error CS0433: The type 'AssemblyFileVersionAttribute' exists in both 'System.Runtime, Version=4.1.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' and 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'
1>obj\Debug\netstandard2.0\AspenTechnology.EngArchAndCompDemo.Core.Shared.AssemblyInfo.cs(18,30,18,67): error CS0433: The type 'AssemblyInformationalVersionAttribute' exists in both 'System.Runtime, Version=4.1.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' and 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'
1>obj\Debug\netstandard2.0\AspenTechnology.EngArchAndCompDemo.Core.Shared.AssemblyInfo.cs(19,30,19,54): error CS0433: The type 'AssemblyProductAttribute' exists in both 'System.Runtime, Version=4.1.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' and 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'
1>obj\Debug\netstandard2.0\AspenTechnology.EngArchAndCompDemo.Core.Shared.AssemblyInfo.cs(20,30,20,52): error CS0433: The type 'AssemblyTitleAttribute' exists in both 'System.Runtime, Version=4.1.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' and 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'
1>obj\Debug\netstandard2.0\AspenTechnology.EngArchAndCompDemo.Core.Shared.AssemblyInfo.cs(21,30,21,54): error CS0433: The type 'AssemblyVersionAttribute' exists in both 'System.Runtime, Version=4.1.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' and 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'
1>C:\Users\olawoyin\AppData\Local\Temp\.NETStandard,Version=v2.0.AssemblyAttributes.cs(4,71,4,98): error CS0518: Predefined type 'System.String' is not defined or imported
1>C:\Users\olawoyin\AppData\Local\Temp\.NETStandard,Version=v2.0.AssemblyAttributes.cs(4,100,4,120): error CS0246: The type or namespace name 'FrameworkDisplayName' could not be found (are you missing a using directive or an assembly reference?)
1>C:\Users\olawoyin\AppData\Local\Temp\.NETStandard,Version=v2.0.AssemblyAttributes.cs(4,123,4,125): error CS0518: Predefined type 'System.String' is not defined or imported
1>obj\Debug\netstandard2.0\AspenTechnology.EngArchAndCompDemo.Core.Shared.AssemblyInfo.cs(14,55,14,103): error CS0518: Predefined type 'System.String' is not defined or imported
1>obj\Debug\netstandard2.0\AspenTechnology.EngArchAndCompDemo.Core.Shared.AssemblyInfo.cs(15,61,15,68): error CS0518: Predefined type 'System.String' is not defined or imported
1>obj\Debug\netstandard2.0\AspenTechnology.EngArchAndCompDemo.Core.Shared.AssemblyInfo.cs(16,59,16,80): error CS0518: Predefined type 'System.String' is not defined or imported
1>obj\Debug\netstandard2.0\AspenTechnology.EngArchAndCompDemo.Core.Shared.AssemblyInfo.cs(17,59,17,68): error CS0518: Predefined type 'System.String' is not defined or imported
1>obj\Debug\netstandard2.0\AspenTechnology.EngArchAndCompDemo.Core.Shared.AssemblyInfo.cs(18,68,18,75): error CS0518: Predefined type 'System.String' is not defined or imported
1>obj\Debug\netstandard2.0\AspenTechnology.EngArchAndCompDemo.Core.Shared.AssemblyInfo.cs(19,55,19,103): error CS0518: Predefined type 'System.String' is not defined or imported
1>obj\Debug\netstandard2.0\AspenTechnology.EngArchAndCompDemo.Core.Shared.AssemblyInfo.cs(20,53,20,101): error CS0518: Predefined type 'System.String' is not defined or imported
1>obj\Debug\netstandard2.0\AspenTechnology.EngArchAndCompDemo.Core.Shared.AssemblyInfo.cs(21,55,21,64): error CS0518: Predefined type 'System.String' is not defined or imported
1>CSC : error CS0518: Predefined type 'System.Void' is not defined or imported
1>CSC : error CS0518: Predefined type 'System.Boolean' is not defined or imported
1>Editions\EditionPaymentType.cs(3,17,3,35): error CS0518: Predefined type 'System.Enum' is not defined or imported
1>Chat\ChatMessageReadState.cs(3,17,3,37): error CS0518: Predefined type 'System.Enum' is not defined or imported
1>Friendships\FriendshipState.cs(3,17,3,32): error CS0518: Predefined type 'System.Enum' is not defined or imported
1>EngArchAndCompDemoConsts.cs(3,18,3,42): error CS0518: Predefined type 'System.Object' is not defined or imported
1>MultiTenancy\TenantConsts.cs(3,18,3,30): error CS0518: Predefined type 'System.Object' is not defined or imported
1>MultiTenancy\Payments\CreatePaymentResponse.cs(3,27,3,48): error CS0518: Predefined type 'System.Object' is not defined or imported
1>Validation\ValidationHelper.cs(6,25,6,41): error CS0518: Predefined type 'System.Object' is not defined or imported
1>Authorization\Users\UserConsts.cs(3,18,3,28): error CS0518: Predefined type 'System.Object' is not defined or imported
1>Notifications\AppNotificationNames.cs(6,25,6,45): error CS0518: Predefined type 'System.Object' is not defined or imported
1>Security\PasswordComplexitySetting.cs(3,18,3,43): error CS0518: Predefined type 'System.Object' is not defined or imported
1>Editions\EditionPaymentType.cs(3,17,3,35): error CS0518: Predefined type 'System.Int32' is not defined or imported
1>Friendships\FriendshipState.cs(3,17,3,32): error CS0518: Predefined type 'System.Int32' is not defined or imported
1>Chat\ChatMessageReadState.cs(3,17,3,37): error CS0518: Predefined type 'System.Int32' is not defined or imported
1>Notifications\AppNotificationNames.cs(8,22,8,28): error CS0518: Predefined type 'System.String' is not defined or imported
1>Validation\ValidationHelper.cs(8,22,8,28): error CS0518: Predefined type 'System.String' is not defined or imported
1>EngArchAndCompDemoConsts.cs(5,22,5,28): error CS0518: Predefined type 'System.String' is not defined or imported
1>MultiTenancy\TenantConsts.cs(5,22,5,28): error CS0518: Predefined type 'System.String' is not defined or imported
1>Authorization\Users\UserConsts.cs(5,22,5,25): error CS0518: Predefined type 'System.Int32' is not defined or imported
1>Notifications\AppNotificationNames.cs(9,22,9,28): error CS0518: Predefined type 'System.String' is not defined or imported
1>Notifications\AppNotificationNames.cs(10,22,10,28): error CS0518: Predefined type 'System.String' is not defined or imported
1>EngArchAndCompDemoConsts.cs(7,22,7,28): error CS0518: Predefined type 'System.String' is not defined or imported
1>EngArchAndCompDemoConsts.cs(9,22,9,26): error CS0518: Predefined type 'System.Boolean' is not defined or imported
1>EngArchAndCompDemoConsts.cs(11,22,11,25): error CS0518: Predefined type 'System.Int32' is not defined or imported
1>MultiTenancy\TenantConsts.cs(7,22,7,28): error CS0518: Predefined type 'System.String' is not defined or imported
1>MultiTenancy\TenantConsts.cs(9,22,9,25): error CS0518: Predefined type 'System.Int32' is not defined or imported
1>MultiTenancy\Payments\CreatePaymentResponse.cs(5,25,5,31): error CS0518: Predefined type 'System.String' is not defined or imported
1>Validation\ValidationHelper.cs(10,36,10,42): error CS0518: Predefined type 'System.String' is not defined or imported
1>Validation\ValidationHelper.cs(10,23,10,27): error CS0518: Predefined type 'System.Boolean' is not defined or imported
1>Security\PasswordComplexitySetting.cs(5,28,5,53): error CS0518: Predefined type 'System.Object' is not defined or imported
1>Security\PasswordComplexitySetting.cs(5,16,5,20): error CS0518: Predefined type 'System.Boolean' is not defined or imported
1>MultiTenancy\Payments\ExecutePaymentResponse.cs(3,27,3,49): error CS0518: Predefined type 'System.Object' is not defined or imported
1>MultiTenancy\Payments\ExecutePaymentResponse.cs(5,25,5,31): error CS0518: Predefined type 'System.String' is not defined or imported
1>MultiTenancy\Payments\PaymentPeriodType.cs(3,17,3,34): error CS0518: Predefined type 'System.Enum' is not defined or imported
1>MultiTenancy\Payments\PaymentPeriodType.cs(3,17,3,34): error CS0518: Predefined type 'System.Int32' is not defined or imported
1>Security\PasswordComplexitySetting.cs(20,16,20,20): error CS0518: Predefined type 'System.Boolean' is not defined or imported
1>Editions\EditionPaymentType.cs(8,27,8,28): error CS0518: Predefined type 'System.Int32' is not defined or imported
1>EngArchAndCompDemoConsts.cs(5,54,5,74): error CS0518: Predefined type 'System.String' is not defined or imported
1>Authorization\Users\UserConsts.cs(5,49,5,51): error CS0518: Predefined type 'System.Int32' is not defined or imported
1>Notifications\AppNotificationNames.cs(8,55,8,84): error CS0518: Predefined type 'System.String' is not defined or imported
1>MultiTenancy\TenantConsts.cs(5,48,5,77): error CS0518: Predefined type 'System.String' is not defined or imported
1>Validation\ValidationHelper.cs(8,42,8,91): error CS0518: Predefined type 'System.String' is not defined or imported
1>MultiTenancy\Payments\PaymentPeriodType.cs(5,19,5,21): error CS0518: Predefined type 'System.Int32' is not defined or imported
1>Chat\ChatMessageReadState.cs(5,18,5,19): error CS0518: Predefined type 'System.Int32' is not defined or imported
1>Friendships\FriendshipState.cs(5,20,5,21): error CS0518: Predefined type 'System.Int32' is not defined or imported
1>Editions\EditionPaymentType.cs(13,18,13,19): error CS0518: Predefined type 'System.Int32' is not defined or imported
1>Editions\EditionPaymentType.cs(18,19,18,20): error CS0518: Predefined type 'System.Int32' is not defined or imported
1>Editions\EditionPaymentType.cs(23,18,23,19): error CS0518: Predefined type 'System.Int32' is not defined or imported
1>Chat\ChatMessageReadState.cs(7,16,7,17): error CS0518: Predefined type 'System.Int32' is not defined or imported
1>Chat\ChatSide.cs(3,17,3,25): error CS0518: Predefined type 'System.Enum' is not defined or imported
1>Chat\ChatSide.cs(3,17,3,25): error CS0518: Predefined type 'System.Int32' is not defined or imported
1>Friendships\FriendshipState.cs(6,19,6,20): error CS0518: Predefined type 'System.Int32' is not defined or imported
1>Notifications\AppNotificationNames.cs(9,49,9,72): error CS0518: Predefined type 'System.String' is not defined or imported
1>Notifications\AppNotificationNames.cs(10,51,10,76): error CS0518: Predefined type 'System.String' is not defined or imported
1>Chat\ChatSide.cs(5,18,5,19): error CS0518: Predefined type 'System.Int32' is not defined or imported
1>Chat\ChatSide.cs(7,20,7,21): error CS0518: Predefined type 'System.Int32' is not defined or imported
1>MultiTenancy\Payments\PaymentPeriodType.cs(6,18,6,21): error CS0518: Predefined type 'System.Int32' is not defined or imported
1>MultiTenancy\Payments\SubscriptionPaymentGatewayType.cs(3,17,3,47): error CS0518: Predefined type 'System.Enum' is not defined or imported
1>MultiTenancy\Payments\SubscriptionPaymentGatewayType.cs(3,17,3,47): error CS0518: Predefined type 'System.Int32' is not defined or imported
1>EngArchAndCompDemoConsts.cs(7,52,7,61): error CS0518: Predefined type 'System.String' is not defined or imported
1>MultiTenancy\Payments\SubscriptionPaymentGatewayType.cs(5,18,5,19): error CS0518: Predefined type 'System.Int32' is not defined or imported
1>MultiTenancy\TenantConsts.cs(7,49,7,58): error CS0518: Predefined type 'System.String' is not defined or imported
1>MultiTenancy\TenantConsts.cs(9,42,9,45): error CS0518: Predefined type 'System.Int32' is not defined or imported
1>EngArchAndCompDemoConsts.cs(9,49,9,53): error CS0518: Predefined type 'System.Boolean' is not defined or imported
1>EngArchAndCompDemoConsts.cs(11,58,11,60): error CS0518: Predefined type 'System.Int32' is not defined or imported
1>Security\PasswordComplexitySetting.cs(20,41,20,45): error CS0518: Predefined type 'System.Void' is not defined or imported
1>Security\PasswordComplexitySetting.cs(22,16,22,20): error CS0518: Predefined type 'System.Boolean' is not defined or imported
1>Security\PasswordComplexitySetting.cs(22,45,22,49): error CS0518: Predefined type 'System.Void' is not defined or imported
1>Security\PasswordComplexitySetting.cs(24,16,24,20): error CS0518: Predefined type 'System.Boolean' is not defined or imported
1>Security\PasswordComplexitySetting.cs(24,51,24,55): error CS0518: Predefined type 'System.Void' is not defined or imported
1>Security\PasswordComplexitySetting.cs(26,16,26,20): error CS0518: Predefined type 'System.Boolean' is not defined or imported
1>Security\PasswordComplexitySetting.cs(26,45,26,49): error CS0518: Predefined type 'System.Void' is not defined or imported
1>Security\PasswordComplexitySetting.cs(28,16,28,19): error CS0518: Predefined type 'System.Int32' is not defined or imported
1>Security\PasswordComplexitySetting.cs(28,42,28,46): error CS0518: Predefined type 'System.Void' is not defined or imported