add to shared module

src/app/shared/shared.module.ts

@@ -285,6 +285,7 @@ import { NgxPaginationModule } from 'ngx-pagination';
 import { SplitPipe } from './utils/split.pipe';
 import { ThemedUserMenuComponent } from './auth-nav-menu/user-menu/themed-user-menu.component';
 import { ThemedLangSwitchComponent } from './lang-switch/themed-lang-switch.component';
+import { IpV4Validator } from "./utils/ipV4.validator";
 
 const MODULES = [
   CommonModule,
@@ -495,6 +496,7 @@ const DIRECTIVES = [
   MetadataFieldValidator,
   HoverClassDirective,
   ContextHelpDirective,
+  IpV4Validator
 ];
 
 @NgModule({