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How do I do logging messages in startup.cs? I cannot inject the logger.

I want to use chache for custom login data

this is my cache call

var myCache = await _cacheManager.GetCache("MyCache") .GetAsync(AbpSession.UserId.ToString(), async () => await GetCacheFromSomewhere(AbpSession.UserId)) as NdCacheRecord;
private async Task<NdCacheRecord> GetCacheFromSomewhere(long? userId) { return new NdCacheRecord() } async () => await GetCacheFromSomewhere(AbpSession.UserId)

gives syntax error: Delegate Func<string, Task<object>> does not take 0 arguments

What should this look like?