urbanterror display error

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http://chakra-project.org – so i just insatlled urbanterror and it worked just fine. Then i decided to set a higher resolution and now it wont load.i get this error Initializing OpenGL display...setting mode 9: 1600 1200X Error of failed request:  BadValue (integer parameter out of range for operation)  Major opcode of failed request:  131 (XFree86-VidModeExtension)  Minor opcode of failed request:  10 (XF86VidModeSwitchToMode)  Value in failed request:  0xc0  Serial number of failed request:  141  Current serial number in output stream:  143So.. I guess I want to kn (HowTos)