Signal 11 caught. Assertion failed: IsInGameThread()

I Compiled UE 4.5 on Ubuntu 14.04 without any problems using clang 3.4

but when i try to run the editor i get a balck splash screens and then it disappears and i get this error

Signal 11 caught.
EngineCrashHandler: Signal=11
[2014.10.21-14.17.16:051][  0]LogLinux:Error: appError called: Assertion failed: Assertion failed: IsInGameThread() [File:/home/yaseeneltii/Desktop/UnrealEngine-4.5/Engine/Source/Runtime/Core/Private/HAL/ThreadingBase.cpp] [Line: 632] 

I Have a Quad Core CoreI7 ( 3630QM ) 8GB RAM AMD Radeon 7670M 2GB ( That Supports Up To OpenGL 4.4 ) with the latest Drivers

Wheres the Problem ?

That is the reason why we don’t support clang 3.4. Please recompile with clang 3.3 or 3.5.

oh ok thanks :)) downloading 3.3 right now
should that solve all of the problems ?

It should make that assert go away.

thanks it worked well i just have to run the editor as root :))

You should not need root for the editor, do not run it as root! (unless you trust the code not to nuke your filesystem).