diff --git a/projects/common/app.module.ts b/projects/common/app.module.ts
index 42b2cdbf248430cf79002938070007bdcf73458e..13a54d153ea13421e0e436278ee051c4c90f9e30 100644
--- a/projects/common/app.module.ts
+++ b/projects/common/app.module.ts
@@ -20,6 +20,7 @@ import { MatSnackBarModule } from '@angular/material/snack-bar';
 import { MatTooltipModule } from '@angular/material/tooltip';
 
 import { TranslateModule } from '@ngx-translate/core';
+import { MatDialogModule } from '@angular/material/dialog';
 import { TextComponent } from './element-components/text.component';
 import { ButtonComponent } from './element-components/button.component';
 import { TextFieldComponent } from './element-components/text-field.component';
@@ -45,6 +46,7 @@ import { NumberFieldComponent } from './element-components/number-field.componen
     FormsModule,
     MatFormFieldModule,
     MatInputModule,
+    MatDialogModule,
     TranslateModule
   ],
   declarations: [
@@ -91,6 +93,7 @@ import { NumberFieldComponent } from './element-components/number-field.componen
     CorrectionComponent,
     MatSnackBarModule,
     MatTooltipModule,
+    MatDialogModule,
     TranslateModule
   ]
 })
diff --git a/projects/common/assets/i18n/de.json b/projects/common/assets/i18n/de.json
index c5dd2dcc30002e81f39a74e752d573d1aa66cfca..5b5eee08261da928c21658612418e78570465906 100644
--- a/projects/common/assets/i18n/de.json
+++ b/projects/common/assets/i18n/de.json
@@ -1,3 +1,4 @@
 {
-  "pageIndication": "Seite {{index}}"
+  "pageIndication": "Seite {{index}}",
+  "close": "Schließen"
 }
diff --git a/projects/editor/src/app/app.module.ts b/projects/editor/src/app/app.module.ts
index 1ec1c595af06f6f3df5efeb861b446dac5a21c68..23f6ecd352c8c23e600541047d0fe8f05484c19d 100644
--- a/projects/editor/src/app/app.module.ts
+++ b/projects/editor/src/app/app.module.ts
@@ -5,7 +5,6 @@ import { CommonModule } from '@angular/common';
 import { createCustomElement } from '@angular/elements';
 import { TranslateLoader, TranslateModule } from '@ngx-translate/core';
 
-import { MatDialogModule } from '@angular/material/dialog';
 import { MatButtonToggleModule } from '@angular/material/button-toggle';
 
 import { AppComponent } from './app.component';
@@ -49,7 +48,6 @@ import { ElementPropertiesComponent } from './components/unit-view/page-view/pro
     BrowserAnimationsModule,
     CommonModule,
     SharedModule,
-    MatDialogModule,
     MatButtonToggleModule,
     TranslateModule.forRoot({
       loader: {
diff --git a/projects/player/src/app/app.component.ts b/projects/player/src/app/app.component.ts
index 5e903a66d890001c3d38501e4b1fef5858f23ca3..6be1617b55df77e6bdacbd0fdb70cb5891600b7d 100644
--- a/projects/player/src/app/app.component.ts
+++ b/projects/player/src/app/app.component.ts
@@ -1,6 +1,7 @@
 import { Component, OnInit } from '@angular/core';
 import { FormGroup } from '@angular/forms';
 import { TranslateService } from '@ngx-translate/core';
+import { MatDialog } from '@angular/material/dialog';
 import {
   Unit, UnitPage, UnitPageSection, UnitUIElement
 } from '../../../common/unit';
@@ -10,6 +11,7 @@ import { NativeEventService } from './services/native-event.service';
 import { MetaDataService } from './services/meta-data.service';
 import { PlayerConfig, UnitState, VopStartCommand } from './models/verona';
 import { FormPage } from '../../../common/form';
+import { AlertDialogComponent } from './components/alert-dialog/alert-dialog.component';
 
 @Component({
   selector: 'player-aspect',
@@ -26,7 +28,8 @@ export class AppComponent implements OnInit {
               private veronaSubscriptionService: VeronaSubscriptionService,
               private veronaPostService: VeronaPostService,
               private metaDataService: MetaDataService,
-              private nativeEventService: NativeEventService) {
+              private nativeEventService: NativeEventService,
+              private dialog: MatDialog) {
   }
 
   ngOnInit(): void {
@@ -53,7 +56,13 @@ export class AppComponent implements OnInit {
         this.pages = this.addStoredValues(pages, storedPages);
       } else {
         // eslint-disable-next-line no-console
-        console.warn('player: wrong unitStateDataType');
+        this.dialog.open(AlertDialogComponent, {
+          data: {
+            title: this.translateService.instant('dialogTitle.wrongUnitStateDataType'),
+            content: this.translateService.instant('dialogContent.wrongUnitStateDataType',
+              { version: this.metaDataService.playerMetadata.supportedUnitStateDataTypes })
+          }
+        });
         this.pages = pages;
       }
     } else {
@@ -70,8 +79,13 @@ export class AppComponent implements OnInit {
       this.playerConfig = message.playerConfig || {};
       this.initUnitPages(unitDefinition.pages, message.unitState);
     } else {
-      // eslint-disable-next-line no-console
-      console.warn('player: wrong unitDefinitionType');
+      this.dialog.open(AlertDialogComponent, {
+        data: {
+          title: this.translateService.instant('dialogTitle.wrongUnitDefinitionType'),
+          content: this.translateService.instant('dialogContent.wrongUnitDefinitionType',
+            { version: this.metaDataService.playerMetadata.supportedUnitDefinitionTypes })
+        }
+      });
     }
   }
 
diff --git a/projects/player/src/app/app.module.ts b/projects/player/src/app/app.module.ts
index c09ff7e2f45986ce53af3e0d35c9cfeb900184e6..37884b64f4142a7468772339b008783c5805c6a1 100644
--- a/projects/player/src/app/app.module.ts
+++ b/projects/player/src/app/app.module.ts
@@ -16,6 +16,7 @@ import { PlayerTranslateLoader } from './classes/player-translate-loader';
 import { LayoutComponent } from './components/layout/layout.component';
 import { HideFirstChildDirective } from './directives/hide-first-child.directive';
 import { ScrollIndexDirective } from './directives/scroll-index.directive';
+import { AlertDialogComponent } from './components/alert-dialog/alert-dialog.component';
 
 @NgModule({
   declarations: [
@@ -27,6 +28,7 @@ import { ScrollIndexDirective } from './directives/scroll-index.directive';
     FormComponent,
     PlayerStateComponent,
     LayoutComponent,
+    AlertDialogComponent,
     HideFirstChildDirective,
     ScrollIndexDirective
   ],
diff --git a/projects/player/src/app/components/alert-dialog/alert-dialog.component.css b/projects/player/src/app/components/alert-dialog/alert-dialog.component.css
new file mode 100644
index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
diff --git a/projects/player/src/app/components/alert-dialog/alert-dialog.component.html b/projects/player/src/app/components/alert-dialog/alert-dialog.component.html
new file mode 100644
index 0000000000000000000000000000000000000000..a40f393687e62d5a48666922a019e290e86e0e32
--- /dev/null
+++ b/projects/player/src/app/components/alert-dialog/alert-dialog.component.html
@@ -0,0 +1,5 @@
+<h2 mat-dialog-title>{{data.title}}</h2>
+<mat-dialog-content>{{data.content}}</mat-dialog-content>
+<mat-dialog-actions>
+  <button mat-button mat-dialog-close>{{'close' | translate}}</button>
+</mat-dialog-actions>
diff --git a/projects/player/src/app/components/alert-dialog/alert-dialog.component.ts b/projects/player/src/app/components/alert-dialog/alert-dialog.component.ts
new file mode 100644
index 0000000000000000000000000000000000000000..8c8f5a299eb5bbc54965efb65b754a49382ee529
--- /dev/null
+++ b/projects/player/src/app/components/alert-dialog/alert-dialog.component.ts
@@ -0,0 +1,11 @@
+import { Component, Inject } from '@angular/core';
+import { MAT_DIALOG_DATA } from '@angular/material/dialog';
+
+@Component({
+  selector: 'app-alert-dialog',
+  templateUrl: './alert-dialog.component.html',
+  styleUrls: ['./alert-dialog.component.css']
+})
+export class AlertDialogComponent {
+  constructor(@Inject(MAT_DIALOG_DATA) public data: { title: string, content: string }) { }
+}
diff --git a/projects/player/src/assets/i18n/de.json b/projects/player/src/assets/i18n/de.json
index 12e695e3ce1859dfe4388d794212636c539c312e..8ab32af029f3d35d70b75e5e8ae6bdc44bdadb70 100644
--- a/projects/player/src/assets/i18n/de.json
+++ b/projects/player/src/assets/i18n/de.json
@@ -10,5 +10,13 @@
     "InputTooLong": "Eingabe zu lang",
     "ValueTooSmall": "Wert zu klein",
     "ValueTooBig": "Wert zu groß"
+  },
+  "dialogTitle": {
+    "wrongUnitDefinitionType": "Falscher Unit-Definition-Type",
+    "wrongUnitStateDataType": "Falscher Unit-State-Data-Type"
+  },
+  "dialogContent": {
+    "wrongUnitDefinitionType": "Der Player benötigt einen Unit-Definition-Type in der Version {{version}}.",
+    "wrongUnitStateDataType": "Der Player benötigt einen Unit-State-Data-Type in der Version {{version}}."
   }
 }