Upgrading Angular 14 to Angular 15 throws error on build

UPDATE:

On deleting .angular, node_modules and package-lock.json, then doing a fresh install and start fixed the issue.

You need to add AgGridModule to the module, which has the PartywiseOrderComponent in it's declarations array.

Let's assume the component belongs to ModuleX.

@NgModule({
  declarations: [
    ...
    PartywiseOrderComponent,
    ...
  ],
  imports: [
    ...
    AgGridModule,
    ...
  ],
})
export class ModuleX {}

teps to make application Proper Upgradation:-

this links for the ag-grid datatable integration:- add-ag-grid-to-your-project

You can check this how can we upgrade the application link:- update-guide-14-15

Angular feature-modules:- angular-feature-modules

Angular Reactive Forms Guide:- angular-reactive-forms

then you need to check whether all the dependencies are installed in the application or not

Demo Code:-

import { NgModule, CUSTOM_ELEMENTS_SCHEMA } from '@angular/core';
import { CommonModule } from '@angular/common';
import { BrowserModule } from '@angular/platform-browser';
import { BrowserAnimationsModule } from '@angular/platform-browser/animations';
import { FormsModule, ReactiveFormsModule } from '@angular/forms';
import { AgGridModule } from 'ag-grid-angular';

// Your Components Add Step By Step....

@NgModule({
  declarations: [
    ProductwiseOrderComponent,
    StockSizewiseComponent,
    LabelStickerTemplatesComponent,
    PartywiseOrderComponent,
    ...
  ],
  imports: [
    BrowserModule,
    BrowserAnimationsModule,
    CommonModule,
    FormsModule,
    ReactiveFormsModule,
    AgGridModule,
    RoutingModule,
    ...
  ],
  exports: [
    LabelStickerTemplatesComponent
    ...
  ],
  schemas: [CUSTOM_ELEMENTS_SCHEMA, ...]
})
export class ReportsModule {
  constructor() { ... }
}

Note:-
You need to add AgGridModule to the module that has the PartywiseOrderComponent in its declarations array.

Assuming the component belongs to Module, this issue seems related to module imports and exports.

If you follow above steps, you should be able to resolve the error.

way 2:-
If above solution does not work then follow this
We need to check whether caching is there

npm uninstall -g @angular/cli

npm cache clean --force

npm install -g @angular/[email protected]

ng new angular15App (copy src folder along with necessary files like package.json and all...)

npm install --force

ng build

ng serve

This will solve the error