Update app.module.ts

Author: vinoth-Kumar-S

src/app/app.module.ts

@@ -3,16 +3,14 @@ import { BrowserModule } from '@angular/platform-browser';
 
 import { AppComponent } from './app.component';
 import { DiagramModule } from '@syncfusion/ej2-angular-diagrams';
-import { ButtonModule } from '@syncfusion/ej2-angular-buttons';
 
 @NgModule({
   declarations: [
     AppComponent
   ],
   imports: [
     BrowserModule,
-    DiagramModule,
-    ButtonModule
+    DiagramModule
   ],
   providers: [],
   bootstrap: [AppComponent]