Appears in the NgModule.imports of TypeModule, but itself has errors

[SIRAAJ-UI]

After upgrade to angular 8.1 to angular 9.

error
export class PageModule{ }
~~~~~~~~~~~~~
src/app/file-explorer.module.ts:32:14 - error NG6002: Appears in the NgModule.imports of PageModule, but itself has errors

[alan-agius4]

@whitegoat, can you please provide a minimal reproduction or at the very minimum the file-explorer.module.ts ?

[alxhub]

Do you have other errors in your project? NG6002 is generated when you import a module that's already broken for some reason, and there should be other messages about why.

[hawlik]

Hi, we faced similar errors when we build on gitlab and linking node_modules folder with ln -s

ERROR in node_modules/@angular/cdk/stepper/stepper-module.d.ts:8:22 - error NG6002: Appears in the NgModule.imports of AppStepperModule, but could not be resolved to an NgModule class

8 export declare class CdkStepperModule {
~~~~~~~~~~~~~~~~
node_modules/@angular/cdk/stepper/stepper-module.d.ts:8:22 - error NG6003: Appears in the NgModule.exports of AppStepperModule, but could not be resolved to an NgModule, Component, Directive, or Pipe class

8 export declare class CdkStepperModule {
~~~~~~~~~~~~~~~~
src/app/common/app-stepper/app-stepper.module.ts:16:14 - error NG6002: Appears in the NgModule.imports of SharedModule, but itself has errors

16 export class AppStepperModule {}
~~~~~~~~~~~~~~~~
src/app/common/app-stepper/app-stepper.module.ts:16:14 - error NG6003: Appears in the NgModule.exports of SharedModule, but itself has errors

16 export class AppStepperModule {}
~~~~~~~~~~~~~~~~
src/app/common/shared.module.ts:64:14 - error NG6002: Appears in the NgModule.imports of UserContextModule, but itself has errors

64 export class SharedModule {}
~~~~~~~~~~~~
src/app/common/shared.module.ts:64:14 - error NG6002: Appears in the NgModule.imports of LoginModule, but itself has errors

64 export class SharedModule {}
~~~~~~~~~~~~
src/app/account/user-context/user-context.module.ts:47:14 - error NG6002: Appears in the NgModule.imports of AuthModule, but itself has errors

47 export class UserContextModule {}
~~~~~~~~~~~~~~~~~
src/app/auth/login/login.module.ts:15:14 - error NG6002: Appears in the NgModule.imports of AuthModule, but itself has errors

.... and there is more.

When I disable this cache mechanism, the build is successful.
when building locally there is no issue as well.