Cannot migrate from 11.6.3 to 12

Current Behavior

I cannot migrate my workspace from nx 11.6.3 to 12. Running the migrations I get the following error

>  NX  Running migrations from 'migrations.json'

Running migration update-ngcc-postinstall
Successfully finished update-ngcc-postinstall
---------------------------------------------------------
Running migration update-webpack-browser-config
Successfully finished update-webpack-browser-config
---------------------------------------------------------
Running migration update-storybook
Successfully finished update-storybook
---------------------------------------------------------
Running migration update-angular-eslint-rules
Successfully finished update-angular-eslint-rules
---------------------------------------------------------
Running migration convert-webpack-browser-build-target-to-delegate-build
Successfully finished convert-webpack-browser-build-target-to-delegate-build
---------------------------------------------------------
Running migration update-angular-config-v12
Cannot read property 'startsWith' of undefined

Alan from the Angular CLI Team answered my unrelated question in this issue. https://github.com/angular/angular-cli/issues/21075#issuecomment-856668743

Our libraries do not have a builder property.

Expected Behavior

I can migrate to nx 12

Environment

>  NX  Report complete - copy this into the issue template

  Node : 14.15.5
  OS   : linux x64
  npm  : 6.14.13
  
  nx : Not Found
  @nrwl/angular : 12.3.6
  @nrwl/cli : 12.3.6
  @nrwl/cypress : 12.3.6
  @nrwl/devkit : 12.3.6
  @nrwl/eslint-plugin-nx : 12.3.6
  @nrwl/express : 12.3.6
  @nrwl/jest : 12.3.6
  @nrwl/linter : 12.3.6
  @nrwl/nest : Not Found
  @nrwl/next : Not Found
  @nrwl/node : 12.3.6
  @nrwl/react : Not Found
  @nrwl/schematics : Not Found
  @nrwl/tao : 12.3.6
  @nrwl/web : Not Found
  @nrwl/workspace : 12.3.6
  @nrwl/storybook : 12.3.6
  @nrwl/gatsby : Not Found
  typescript : 4.2.4

[mehrad-rafigh]

Thanks @leosvelperez that clears a big question mark in my head. I will take a look which one of the projects do not a have a builder property

[leosvelperez]

@mehrad-rafigh all targets in that project (lint and test) have a builder property. That project has all its targets correctly configured. I think you might be confusing the builder property with having a target named build, that’s a different thing and having a specific target like that one is not a requirement. You need to check your projects’ targets (objects inside architect) and see which one doesn’t have a builder property defined inside.