[mono-vb] mono-basic running error,help!

[jeffchaisen]

i install the mono,libgdiplus&mono-basic on gentoo livecd(livecd maked by
myself),i have a vb(name is Desero.exe) program now.error when i run mono
Desero.exe in terminal.
note:the program run in my gentoo system is ok,but in my livecd is bad. 

error message:
Unhandled Exception: System.InvalidOperationException: An error occured
while creating the form. See Exception.InnerException for details. The error
is: An exception was thrown by the type initializer for
System.Windows.Forms.WindowsFormsSynchronizationContext --->
System.TypeInitializationException: An exception was thrown by the type
initializer for System.Windows.Forms.WindowsFormsSynchronizationContext --->
System.TypeInitializationException: An exception was thrown by the type
initializer for System.Windows.Forms.XplatUI --->
System.ArgumentNullException: Could not open display (X-Server required.
Check you DISPLAY environment variable)
Parameter name: Display
  at System.Windows.Forms.XplatUIX11.SetDisplay (IntPtr display_handle)
[0x00000] 
  at System.Windows.Forms.XplatUIX11..ctor () [0x00000] 
  at System.Windows.Forms.XplatUIX11.GetInstance () [0x00000] 
  at System.Windows.Forms.XplatUI..cctor () [0x00000] --- End of inner
exception stack trace ---

  at System.Windows.Forms.Control.get_CreateParams () [0x00000] 
  at System.Windows.Forms.Control.InternalSizeFromClientSize (Size
clientSize) [0x00000] 
  at System.Windows.Forms.Control.ClientSizeFromSize (Size size) [0x00000] 
  at System.Windows.Forms.Control..ctor () [0x00000] 
  at (wrapper remoting-invoke-with-check) System.Windows.Forms.Control:.ctor
()
  at System.Windows.Forms.WindowsFormsSynchronizationContext..cctor ()
[0x00000] --- End of inner exception stack trace ---

  at System.Windows.Forms.Control..ctor () [0x00000] 
  at System.Windows.Forms.ScrollableControl..ctor () [0x00000] 
  at System.Windows.Forms.ContainerControl..ctor () [0x00000] 
  at System.Windows.Forms.Form..ctor () [0x00000] 
  at Desero.MainForm..ctor () [0x00000] 
  at (wrapper managed-to-native)
System.Reflection.MonoCMethod:InternalInvoke (object,object[])
  at System.Reflection.MonoCMethod.Invoke (System.Object obj, BindingFlags
invokeAttr, System.Reflection.Binder binder, System.Object[] parameters,
System.Globalization.CultureInfo culture) [0x00000] --- End of inner
exception stack trace ---

  at Desero.My.MyProject+MyForms.Create__Instance__[MainForm]
(Desero.MainForm Instance) [0x00000] 
  at Desero.My.MyProject+MyForms.get_MainForm () [0x00000] 
  at Desero.MainForm.Main () [0x00000] 

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