diff --git a/src/js/app.js b/src/js/app.js
index 53f59d0..6c63ca9 100644
--- a/src/js/app.js
+++ b/src/js/app.js
@@ -300,6 +300,11 @@ controller('AppCtrl', ['$scope', '$http', '$timeout', '$q', '$window', '$httpPar
                 $scope.metadata = null;
                 return;
             }
+            if ( res.data?.exception?.[0]?.message ) {
+                $scope.error = res.data.exception[0].message;
+                $scope.metadata = null;
+                return;
+            }
 
             $scope.metadata = response;
 
@@ -377,7 +382,7 @@ controller('AppCtrl', ['$scope', '$http', '$timeout', '$q', '$window', '$httpPar
 
         }, function(res) {
             $scope.metadata = null;
-            $scope.error = res.data.error;
+            $scope.error = res.data?.exception?.[0]?.message ?? res.data.error;
             $scope.busy = false;
         });
     }
@@ -403,7 +408,8 @@ controller('AppCtrl', ['$scope', '$http', '$timeout', '$q', '$window', '$httpPar
                 height: (area[3] - area[1]) / pixelratio[1]
             });
         }, function(res) {
-            $scope.error = 'An error occurred: ' + res.status + ' ' + res.data.error;
+            $scope.error = 'An error occurred: ' + res.status + ' ' +
+                ( res.data?.exception?.[0]?.message ?? res.data.error );
             $scope.borderLocatorBusy = false;
         });
     };
@@ -581,7 +587,7 @@ controller('AppCtrl', ['$scope', '$http', '$timeout', '$q', '$window', '$httpPar
             }
             $scope.updateUploadComment();
         }, function(res) {
-            $scope.error = '[Error] ' + res.data.error;
+            $scope.error = '[Error] ' + ( res.data?.exception?.[0]?.message ?? res.data.error );
             $scope.ladda = false;
         });
 
@@ -644,7 +650,7 @@ controller('AppCtrl', ['$scope', '$http', '$timeout', '$q', '$window', '$httpPar
 
         }, function(res) {
             $scope.ladda2 = false;
-            $scope.error = 'Upload failed! ' + res.data.error;
+            $scope.error = 'Upload failed! ' + (res.data?.exception?.[0]?.message ?? res.data.error);
         });
 
     };
@@ -720,6 +726,8 @@ controller('AppCtrl', ['$scope', '$http', '$timeout', '$q', '$window', '$httpPar
 
                 if (response.error) {
                     $scope.error = response.error;
+		} else if ( res.data?.exception?.[0]?.message ) {
+			$scope.error = res.data.exception[0].message;
                 } else {
                     $scope.exists[key] = response.exists;
                     // console.log($scope.exists);