handle error

web/repertory/lib/widgets/mount_widget.dart

@@ -66,11 +66,18 @@ class _MountWidgetState extends State<MountWidget> {
                         });
 
                         if (isActive) {
-                          mount.mount(isActive).then((_) {
+                          mount
-                            setState(() {
+                              .mount(isActive)
-                              _enabled = true;
+                              .then((_) {
-                            });
+                                setState(() {
-                          });
+                                  _enabled = true;
+                                });
+                              })
+                              .catchError((_) {
+                                setState(() {
+                                  _enabled = true;
+                                });
+                              });
                           return;
                         }