MATLAB does not recognize my GPUs for cuda execution?

I open Matlab and run gpuDevice(), it gives at UBUNTU 13.10 ;
Error using gpuDevice (line 26)
An unexpected error occurred during CUDA execution. The CUDA error was:
CUDA_ERROR_UNKNOWN
and
if I run gpuDeviceCount(), it returns 0
However if I run nvidia-smi from terminal it shows all the available GPUs and their stats.
I installed both cuda 5.5 and cuda 6.0 but same for both.
Any idea what is the reason behind for such a malfunction?

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