Cannot run LA_EXT plugin

[Celio_A_]

Dear Intel Developers

Last night I tried to encode a video using LA_EXT plugin for H264/AVC from Intel Media Server Studio 2016/2017/2017R2 and 

I don't know what I'm doing wrong, here are the log results, can someone from intel help me out?

C:\Users\Administrator\Documents\Samples for Intel Media Server Studio 2017 for Windows\_bin\x64>sample_multi_transcode  -i::h264 E:\VIDEO.264 -o::h264 E:\VIDEO_p.264 -w 1280 -h 720 -hw_d3d11 -async 3 -la_ext -lad 100 -u 3 -gop_size 240 -dist 4 -num_ref 6 -bref -ec::nv12 -dc::nv12
Multi Transcoding Sample Version 6.0.0.226

OpenCL or chroma conversion is present at least in one session. External memory allocator will be used for all sessions .
plugin_loader.h :166 [ERROR] Failed to load plugin from GUID, sts=-9: { 0x58, 0x8f, 0x11, 0x85, 0xd4, 0x7b, 0x42, 0x96, 0x8d, 0xea, 0x37, 0x7b, 0xb5, 0xd0, 0xdc, 0xb4 } (Intel (R) Media SDK plugin for LA ENC)

[ERROR], sts=MFX_ERR_UNSUPPORTED(-3), TranscodingSample::CTranscodingPipeline::CalculateNumberOfReqFrames, m_pmfxPreENC.get failed at src\pipeline_transcode.cpp:2686

[ERROR], sts=MFX_ERR_UNSUPPORTED(-3), TranscodingSample::CTranscodingPipeline::AllocFrames, CalculateNumberOfReqFrames failed at src\pipeline_transcode.cpp:2526

[ERROR], sts=MFX_ERR_UNSUPPORTED(-3), TranscodingSample::CTranscodingPipeline::Init, AllocFrames failed at src\pipeline_transcode.cpp:3080

[ERROR], sts=MFX_ERR_UNSUPPORTED(-3), TranscodingSample::Launcher::Init, pThreadPipeline->pPipeline->Init failed at src\sample_multi_transcode.cpp:313

[ERROR], sts=MFX_ERR_UNSUPPORTED(-3), wmain, transcode.Init failed at src\sample_multi_transcode.cpp:682

I tried with three different versions of Media Server Studio 2016/2017/2017R2  and all show the same problem, i'm on a 4th generation core i5 4570 processor with HD 4600 IGP