i got this error when i start openra
what can i do?
luca@SIMBADDA:~$ openra
Platform is Linux
Using SDL 1.2 with OpenGL renderer
Desktop resolution: 1280x1024
No custom resolution provided, using desktop resolution
Using resolution: 1280x1024
Failed to set video mode.
Failed to fetch GL_EXTENSIONS, this is bad.
Renderer initialization failed. Fallback in place. Check graphics.log for details.
Using SDL 2 with OpenGL renderer
Renderer initialization failed. Fallback in place. Check graphics.log for details.
Using SDL 1.2 with OpenGL renderer
Desktop resolution: 1280x1024
No custom resolution provided, using desktop resolution
Using resolution: 1280x1024
Failed to set video mode.
Failed to fetch GL_EXTENSIONS, this is bad.
Renderer initialization failed. Fallback in place. Check graphics.log for details.
Using SDL 1.2 with Cg renderer
Desktop resolution: 1280x1024
No custom resolution provided, using desktop resolution
Using resolution: 1280x1024
Failed to set video mode.
Failed to fetch GL_EXTENSIONS, this is bad.
Renderer initialization failed. Fallback in place. Check graphics.log for details.
Exception of type `System.InvalidOperationException`: No suitable renderers were found. Check graphics.log for details.
at OpenRA.Game.Initialize (OpenRA.Arguments args) [0x00000] in <filename unknown>:0
at OpenRA.Program.Run (System.String[] args) [0x00000] in <filename unknown>:0
at OpenRA.Program.Main (System.String[] args) [0x00000] in <filename unknown>:0
Exception of type `System.NullReferenceException`: Object reference not set to an instance of an object
at OpenRA.Program.FatalError (System.Exception e) [0x00000] in <filename unknown>:0
at OpenRA.Program.Main (System.String[] args) [0x00000] in <filename unknown>:0
exception inside UnhandledException handler: Object reference not set to an instance of an object
[ERROR] FATAL UNHANDLED EXCEPTION: System.NullReferenceException: Object reference not set to an instance of an object
at OpenRA.Program.FatalError (System.Exception e) [0x00000] in <filename unknown>:0
at OpenRA.Program.Main (System.String[] args) [0x00000] in <filename unknown>:0