Linux-ObjectViewer crashes

Linux 12.04 64b.
Any OpenBVE program executes on my system but ObjectViewer. It crashes. The output is as follows:

desktop:~/BVE$ cli ObjectViewer.exe
Stacktrace:

at (wrapper managed-to-native) Tao.Sdl.Sdl.SDL_MapRGB (intptr,byte,byte,byte) <0xffffffff>
at OpenBve.Program.Main (string[]) <0x0068f>
at (wrapper runtime-invoke) .runtime_invoke_void_object (object,intptr,intptr,intptr) <0xffffffff>

Native stacktrace:

cli() [0x4916ba]
cli() [0x4e0d4f]
cli() [0x41bc77]
/lib/x86_64-linux-gnu/libpthread.so.0(+0xfcb0) [0x7fc1f84b3cb0]
/usr/lib/x86_64-linux-gnu/libSDL-1.2.so.0(SDL_MapRGB+0x3) [0x7fc1f518c953]
[0x41cfdd8d]

Debug info from gdb:

Could not attach to process. If your uid matches the uid of the target
process, check the setting of /proc/sys/kernel/yama/ptrace_scope, or try
again as the root user. For more details, see /etc/sysctl.d/10-ptrace.conf
ptrace: Operation not permitted.
No threads.

=================================================================
Got a SIGSEGV while executing native code. This usually indicates
a fatal error in the mono runtime or one of the native libraries
used by your application.
=================================================================

Aborted (core dumped)

The same happens when started with mono.
Could somebody help me on it? I would appreciate.

I guess `cli` is just a symlink of `mono`.

What's the version of Mono are you having?

By the way openBVE uses Tao.Framework which hasn't been updated for too long. I think someone will have to port it to OpenTK (although it's just replacing a reference and changing some `using` directives)