@@ -7,11 +7,13 @@
 use ProcessMaker\Models\Process;
 use ProcessMaker\Models\Screen;
 use ProcessMaker\Providers\WorkflowServiceProvider;
+use ProcessMaker\Exception\MaximumRecursionException;
 
 class ScreensInScreen
 {
     public $type = Screen::class;
     public $owner = Screen::class;
+    private $recursion = 0;
 
     /**
      * Get the screens (nested) used in a screen
@@ -23,12 +25,19 @@ class ScreensInScreen
      */
     public function referencesToExport(Screen $screen, array $screens = [])
     {
+        if ($this->recursion > 10) {
+            throw new MaximumRecursionException(
+                "Max screen recursion depth of 10 exceeded. Is a child screen referencing its parent?"
+            );
+        }
+
         $config = $screen->config;
         if (is_array($config)) {
             $this->findInArray($config, function ($item) use (&$screens) {
                 if (is_array($item) && isset($item['component']) && $item['component'] === 'FormNestedScreen' && !empty($item['config']['screen'])) {
                     $screens[] = [Screen::class, $item['config']['screen']];
                     $screen = Screen::findOrFail($item['config']['screen']);
+                    $this->recursion++;
                     $screens = $this->referencesToExport($screen, $screens);
                 }
             });
 
@@ -0,0 +1,9 @@
+<?php
+
+namespace ProcessMaker\Exception;
+
+use Exception;
+
+class MaximumRecursionException extends Exception
+{
+}
@@ -670,7 +670,7 @@ public function export(Request $request, Process $process)
             $url = url("/processes/{$process->id}/download/{$fileKey}");
             return ['url' => $url];
         } else {
-            return response(['error' => __('Unable to Export Process')], 500);
+            return response(['message' => __('Unable to Export Process')], 500);
         }
     }
 
 
@@ -55,7 +55,7 @@
                             ProcessMaker.alert('{{__('The process was exported.')}}', 'success');
                         })
                         .catch(error => {
-                            ProcessMaker.alert(error.response.data.error, 'danger');
+                            ProcessMaker.alert(error.response.data.message, 'danger');
                         });
                 }
             }
 
@@ -60,7 +60,7 @@
                 ProcessMaker.alert('{{__('The screen was exported.')}}', 'success');
               })
               .catch(error => {
-                ProcessMaker.alert(error.response.data.error, 'danger');
+                ProcessMaker.alert(error.response.data.message, 'danger');
               });
           }
         }
 
@@ -56,6 +56,7 @@
     Route::delete('screens/{screen}', 'ScreenController@destroy')->name('screens.destroy')->middleware('can:delete-screens');
     Route::post('screens/{screen}/export', 'ScreenController@export')->name('screens.export')->middleware('can:export-screens');
     Route::post('screens/import', 'ScreenController@import')->name('screens.import')->middleware('can:import-screens');
+    Route::post('screens/preview', 'ScreenController@preview')->name('screens.preview')->middleware('can:edit-screens');
 
     // Screen Categories
     Route::get('screen_categories', 'ScreenCategoryController@index')->name('screen_categories.index')->middleware('can:view-screen-categories');
Original file line number	Diff line number	Diff line change
`@@ -670,7 +670,7 @@ public function export(Request $request, Process $process)`
`670`	`670`	`$url = url("/processes/{$process->id}/download/{$fileKey}");`
`671`	`671`	`return ['url' => $url];`
`672`	`672`	`} else {`
`673`		`- return response(['error' => __('Unable to Export Process')], 500);`
	`673`	`+ return response(['message' => __('Unable to Export Process')], 500);`
`674`	`674`	`}`
`675`	`675`	`}`
`676`	`676`
Original file line number	Diff line number	Diff line change
`@@ -55,7 +55,7 @@`
`55`	`55`	`ProcessMaker.alert('{{__('The process was exported.')}}', 'success');`
`56`	`56`	`})`
`57`	`57`	`.catch(error => {`
`58`		`- ProcessMaker.alert(error.response.data.error, 'danger');`
	`58`	`+ ProcessMaker.alert(error.response.data.message, 'danger');`
`59`	`59`	`});`
`60`	`60`	`}`
`61`	`61`	`}`
Original file line number	Diff line number	Diff line change
`@@ -60,7 +60,7 @@`
`60`	`60`	`ProcessMaker.alert('{{__('The screen was exported.')}}', 'success');`
`61`	`61`	`})`
`62`	`62`	`.catch(error => {`
`63`		`- ProcessMaker.alert(error.response.data.error, 'danger');`
	`63`	`+ ProcessMaker.alert(error.response.data.message, 'danger');`
`64`	`64`	`});`
`65`	`65`	`}`
`66`	`66`	`}`