Unhandled Exception: System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.ArgumentException: Failed to create ToolboxItem of type:  ---> System.TypeLoadException: Could not load type ''.
in <0x00000> <unknown method>
in (wrapper managed-to-native) System.Type:internal_from_name (string,bool,bool)
in <0x00021> System.Type:GetType (System.String typeName, Boolean throwOnError)
in <0x00040> System.ComponentModel.ToolboxItemAttribute:get_ToolboxItemType ()--- End of inner exception stack trace ---
in <0x000ab> System.ComponentModel.ToolboxItemAttribute:get_ToolboxItemType ()
in <0x00000> <unknown method>
in (wrapper managed-to-native) System.Reflection.MonoMethod:InternalInvoke (object,object[])
in <0x0008d> System.Reflection.MonoMethod:Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture)--- End of inner exception stack trace ---

in <0x0010e> System.Reflection.MonoMethod:Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture)
in <0x00067> System.Reflection.MonoProperty:GetValue (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] index, System.Globalization.CultureInfo culture)
in <0x0001a> System.Reflection.PropertyInfo:GetValue (System.Object obj, System.Object[] index)
in <0x000fa> test:Main ()
linux:~ # mono test.exe

Unhandled Exception: System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.ArgumentException: Failed to create ToolboxItem of type:  ---> System.TypeLoadException: Could not load type ''.
in <0x00000> <unknown method>
in (wrapper managed-to-native) System.Type:internal_from_name (string,bool,bool)
in <0x00021> System.Type:GetType (System.String typeName, Boolean throwOnError)
in <0x00040> System.ComponentModel.ToolboxItemAttribute:get_ToolboxItemType ()--- End of inner exception stack trace ---

in <0x000ab> System.ComponentModel.ToolboxItemAttribute:get_ToolboxItemType ()
in <0x00000> <unknown method>
in (wrapper managed-to-native) System.Reflection.MonoMethod:InternalInvoke (object,object[])
in <0x0008d> System.Reflection.MonoMethod:Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture)--- End of inner exception stack trace ---

in <0x0010e> System.Reflection.MonoMethod:Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture)
in <0x00067> System.Reflection.MonoProperty:GetValue (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] index, System.Globalization.CultureInfo culture)
in <0x0001a> System.Reflection.PropertyInfo:GetValue (System.Object obj, System.Object[] index)
in <0x000fa> test:Main ()