Change delete execution

app/services/views.py

@@ -46,9 +46,8 @@ def service(service):
         try:
             os.makedirs(absolut_dir)
         except OSError:
-            flash('[OSError] Could not add job!')
-            db.session.delete(job)
-            db.session.commit()
+            flash('[ERROR]: Could not add job!')
+            job.delete()
         else:
             for file in add_job_form.files.data:
                 filename = secure_filename(file.filename)