using video memory returning MFX_ERR_MEMORY_ALLOC

Hi all,

I'm using a endoder/decoder and when the allocator is going to  perform the memory allocation 

status = mfxAllocator.Alloc(mfxAllocator.pthis, &_encRequest, &mfxEncResponse);

it returns MFX_ERR_MEMORY_ALLOC.

I'm using video memory in hardware mode.

In the decoder part there is no problem I have this problem only in the encoder. is there any reason for that errror? I think that there is enough memory.

Thanks.