Ued Crashes!! - HELP!!!

[kupa84]

as a noob i dont really understand n i get this msg come up when i try n run ued

Assertion failed: Bitmap.LoadFile(Filename) [File:..\..\Engine\Inc\UnEngineWin.h] [Line: 55]

any help on wat this mean n how i can sort it out will b appreciated!!!

cheers!!!

[GateCrasher88]

there might b a prob with ur Config settings;
when exactly does the message come up?
what OS u usin?