Linux - mono - was sagt mir das? - Exception - how to fix?

[jkallup]

Hallo, wie im Thema geschrieben, habe ich Probleme beim erstellen einer EXE Datei.
Anbei die Ausgabe:

Unhandled Exception:
System.InvalidOperationException: 'openFileDialog1.DefaultExt' could not be found.
  at System.Configuration.AppSettingsReader.GetValue (System.String key, System.Type type) [0x00042] in <bb0aa140fcf44b559cb1e44a088e9226>:0
  at Unicode_OCR.Form1.InitializeComponent () [0x005b1] in <95e5e46f25a343bf9c4803039706cd99>:0
  at Unicode_OCR.Form1..ctor () [0x0018f] in <95e5e46f25a343bf9c4803039706cd99>:0
  at (wrapper remoting-invoke-with-check) Unicode_OCR.Form1:.ctor ()
  at Unicode_OCR.Form1.Main () [0x00000] in <95e5e46f25a343bf9c4803039706cd99>:0
[ERROR] FATAL UNHANDLED EXCEPTION: System.InvalidOperationException: 'openFileDialog1.DefaultExt' could not be found.
  at System.Configuration.AppSettingsReader.GetValue (System.String key, System.Type type) [0x00042] in <bb0aa140fcf44b559cb1e44a088e9226>:0
  at Unicode_OCR.Form1.InitializeComponent () [0x005b1] in <95e5e46f25a343bf9c4803039706cd99>:0
  at Unicode_OCR.Form1..ctor () [0x0018f] in <95e5e46f25a343bf9c4803039706cd99>:0
  at (wrapper remoting-invoke-with-check) Unicode_OCR.Form1:.ctor ()
  at Unicode_OCR.Form1.Main () [0x00000] in <95e5e46f25a343bf9c4803039706cd99>:0