show error in Angular 9.0.3

[lieefu]

ERROR in node_modules/ng-easyui/components/easyui/easyui.module.d.ts:1:22 - error NG6002: Appears in the NgModule.imports of AppModule, but could not be resolved to an NgModule class.

This likely means that the library (ng-easyui/components/easyui/easyui.module) which declares EasyUIModule has not been processed correctly by ngcc, or is not compatible with Angular Ivy. Check if a newer version of the library is available, and update if so. Also consider checking with the library's authors to see if the library is expected to be compatible with Ivy.

1 export declare class EasyUIModule {