error selecting my folder w/ omega ruby in pk3ds

[BerendSuurd]

Exception Details:
System.NullReferenceException: De objectverwijzing is niet op een exemplaar van een object ingesteld.
   bij System.Windows.Forms.Control.MarshaledInvoke(Control caller, Delegate method, Object[] args, Boolean synchronous)
   bij System.Windows.Forms.Control.Invoke(Delegate method, Object[] args)
   bij pk3DS.Main.<B_GameText_Click>b__30_0() in C:\BuildAgent\work\ccf72a59f9911202\pk3DS\Main.cs:regel 463
   bij System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   bij System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   bij System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
   bij System.Threading.ThreadHelper.ThreadStart()

Loaded Assemblies:
--------------------
mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
C:\Windows\Microsoft.NET\Framework64\v4.0.30319\mscorlib.dll

pk3DS, Version=1.0.0.396, Culture=neutral, PublicKeyToken=null
C:\Users\berend\Desktop\pk3ds\pk3DS.exe

System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System\v4.0_4.0.0.0__b77a5c561934e089\System.dll

System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Windows.Forms\v4.0_4.0.0.0__b77a5c561934e089\System.Windows.Forms.dll

System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Drawing\v4.0_4.0.0.0__b03f5f7f11d50a3a\System.Drawing.dll

System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Core\v4.0_4.0.0.0__b77a5c561934e089\System.Core.dll

System.Configuration, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Configuration\v4.0_4.0.0.0__b03f5f7f11d50a3a\System.Configuration.dll

System.Xml, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Xml\v4.0_4.0.0.0__b77a5c561934e089\System.Xml.dll

System.Windows.Forms.resources, Version=4.0.0.0, Culture=nl, PublicKeyToken=b77a5c561934e089
C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Windows.Forms.resources\v4.0_4.0.0.0_nl_b77a5c561934e089\System.Windows.Forms.resources.dll

pk3DS.Core, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null
C:\Users\berend\Desktop\pk3ds\pk3DS.Core.dll

mscorlib.resources, Version=4.0.0.0, Culture=nl, PublicKeyToken=b77a5c561934e089
C:\Windows\Microsoft.Net\assembly\GAC_MSIL\mscorlib.resources\v4.0_4.0.0.0_nl_b77a5c561934e089\mscorlib.resources.dll

System.Configuration.resources, Version=4.0.0.0, Culture=nl, PublicKeyToken=b03f5f7f11d50a3a
C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Configuration.resources\v4.0_4.0.0.0_nl_b03f5f7f11d50a3a\System.Configuration.resources.dll

--------------------
User Message:
An unhandled exception has occurred.
The program must now close.
 

[BerendSuurd]

Does anyone know how to fix this so I can randomize pokemon omega ruby? I already have it in a seperste folder.