Sandboxed app & NSOpenPanel causes crashes

Question

I am doing a simple file open panel in my Cocoa app. I enable entitlements and app sandboxing. But on OS X 10.9, when the app should open a dialog using NSOpenPanel

Answer 1

In my case the problem for this error was calling [NSOpenPanel openPanel] on a thread that was not the main one. Encapsulating the whole thing inside a

dispatch_async(dispatch_get_main_queue(), ^{
   NSSavePanel *saveAsPanel = [[NSSavePanel alloc] init];
   // ... bla bla...
 });

solved the problem