GeckoFX App on Citrix Metaframe Server

I recently created a application using the GeckoFX web browser tool on Visual Studio 2010. I loaded my app on the actual server it loads fine, but if I load it via Citrix it gives me the follow error: “application has generated an exception that could not be handled.” then it gives me a process id and thread id. I’m stuck on this problem. I have Citrix Metaframe Server 4.5 on Windows Server 2003 all up-to-date. Is there a reason why this is happening?