Create-bundles not working #8657

I have just purchased Asp.Net Zero and am attempting to get things set up to start working with the project. I've installed Node.js and Yarn per the instructions and tried running the create-bundles process. This fails with the following error: npm run create-bundles

[email protected] create-bundles /Users/davidrutter/Projects/Sapphire/src/Sapphire.Web.Mvc gulp buildDev

internal/modules/cjs/loader.js:985 throw err; ^

Error: Cannot find module 'merge-stream' Require stack:

• /Users/davidrutter/Projects/Sapphire/src/Sapphire.Web.Mvc/gulpfile.js
• /Users/davidrutter/Projects/Sapphire/src/Sapphire.Web.Mvc/node_modules/gulp/node_modules/gulp-cli/lib/versioned/^4.0.0/index.js
• /Users/davidrutter/Projects/Sapphire/src/Sapphire.Web.Mvc/node_modules/gulp/node_modules/gulp-cli/index.js
• /Users/davidrutter/Projects/Sapphire/src/Sapphire.Web.Mvc/node_modules/gulp/bin/gulp.js at Function.Module._resolveFilename (internal/modules/cjs/loader.js:982:15) at Function.Module._load (internal/modules/cjs/loader.js:864:27) at Module.require (internal/modules/cjs/loader.js:1044:19) at require (internal/modules/cjs/helpers.js:77:18) at Object.<anonymous> (/Users/davidrutter/Projects/Sapphire/src/Sapphire.Web.Mvc/gulpfile.js:3:13) at Module._compile (internal/modules/cjs/loader.js:1158:30) at Object.Module._extensions..js (internal/modules/cjs/loader.js:1178:10) at Module.load (internal/modules/cjs/loader.js:1002:32) at Function.Module._load (internal/modules/cjs/loader.js:901:14) at Module.require (internal/modules/cjs/loader.js:1044:19) { code: 'MODULE_NOT_FOUND', requireStack: [ '/Users/davidrutter/Projects/Sapphire/src/Sapphire.Web.Mvc/gulpfile.js', '/Users/davidrutter/Projects/Sapphire/src/Sapphire.Web.Mvc/node_modules/gulp/node_modules/gulp-cli/lib/versioned/^4.0.0/index.js', '/Users/davidrutter/Projects/Sapphire/src/Sapphire.Web.Mvc/node_modules/gulp/node_modules/gulp-cli/index.js', '/Users/davidrutter/Projects/Sapphire/src/Sapphire.Web.Mvc/node_modules/gulp/bin/gulp.js' ] }

Because the bundles don't create properly, the app does not function as it should. I cannot login or change tenant. Please advise as to the problem and how to fix it.