diff --git a/quartz-manager-frontend/src/app/components/simple-trigger-config/simple-trigger-config.component.html b/quartz-manager-frontend/src/app/components/simple-trigger-config/simple-trigger-config.component.html
index 5f96773..6462915 100644
--- a/quartz-manager-frontend/src/app/components/simple-trigger-config/simple-trigger-config.component.html
+++ b/quartz-manager-frontend/src/app/components/simple-trigger-config/simple-trigger-config.component.html
@@ -6,6 +6,14 @@
   <mat-card-content *ngIf="shouldShowTheTriggerCardContent()" style="position: relative; height: 100%">
     <div fxLayout="column" style="overflow-y: auto; position: absolute; left: 0; right: 0; top: 0; bottom: 0;
     overflow: auto;height: calc(100% - 3em); padding-top: 1em;">
+      <mat-card id="noEligibleJobsAlert" *ngIf="jobs?.length === 0" style="background-color: #ff6385">
+        <mat-card-content>
+          <i class="fas fa-exclamation-circle" style="color: #fff"></i>&nbsp;<strong>WARNING</strong>
+          Not found any eligible job classes for quartz-manager! <br/>
+          <p style="font-size: 0.8em">Please, make sure you have extended <i>AbstractQuartzManagerJob</i> and set the
+          app prop <i>quartz-manager.jobClassPackages</i> with the correct java package </p>
+        </mat-card-content>
+      </mat-card>
       <form name="triggerConfigForm" fxFlex="1 1 100%"
             [formGroup]="simpleTriggerReactiveForm" (ngSubmit)="onSubmitTriggerConfig()">
         <div>
diff --git a/quartz-manager-frontend/src/app/components/simple-trigger-config/simple-trigger-config.component.spec.ts b/quartz-manager-frontend/src/app/components/simple-trigger-config/simple-trigger-config.component.spec.ts
index db40566..49fa0c1 100644
--- a/quartz-manager-frontend/src/app/components/simple-trigger-config/simple-trigger-config.component.spec.ts
+++ b/quartz-manager-frontend/src/app/components/simple-trigger-config/simple-trigger-config.component.spec.ts
@@ -220,6 +220,28 @@ describe('SimpleTriggerConfig', () => {
     expect(submitButton.nativeElement.textContent.trim()).toEqual('Submit');
   });
 
+  it('should display the warning if there are no eligible jobs', () => {
+    fixture.detectChanges();
+    const getJobsReq = httpTestingController.expectOne(`${CONTEXT_PATH}/jobs`);
+    getJobsReq.flush([]);
+    fixture.detectChanges();
+
+    const componentDe: DebugElement = fixture.debugElement;
+    const warningCard = componentDe.query(By.css('#noEligibleJobsAlert'));
+    expect(warningCard).toBeTruthy();
+  });
+
+  it('should not display the warning if there are eligible jobs', () => {
+    fixture.detectChanges();
+    const getJobsReq = httpTestingController.expectOne(`${CONTEXT_PATH}/jobs`);
+    getJobsReq.flush(['sampleJob']);
+    fixture.detectChanges();
+
+    const componentDe: DebugElement = fixture.debugElement;
+    const warningCard = componentDe.query(By.css('#noEligibleJobsAlert'));
+    expect(warningCard).toBeFalsy();
+  });
+
 
 
 });
diff --git a/quartz-manager-frontend/src/app/views/not-found/not-found.component.spec.ts b/quartz-manager-frontend/src/app/views/not-found/not-found.component.spec.ts
index 1acb86e..220c31d 100644
--- a/quartz-manager-frontend/src/app/views/not-found/not-found.component.spec.ts
+++ b/quartz-manager-frontend/src/app/views/not-found/not-found.component.spec.ts
@@ -23,10 +23,10 @@ describe('NotFoundComponent', () => {
     expect(component).toBeTruthy();
   });
 
-  it('<h1> tag should contains \'Page Not Found\'', () => {
+  it('should contains the text \'Not Found\'', () => {
     fixture = TestBed.createComponent(NotFoundComponent);
     fixture.detectChanges();
     const compiled = fixture.debugElement.nativeElement;
-    expect(compiled.querySelector('h1').textContent).toContain('Page Not Found');
+    expect(compiled.querySelector('p').textContent).toContain('Not Found');
   });
 });