Build & Capture TS (MDT) - Capture fails at PrepareOS (sysprep) with "Boot Image package not found"

Hi all,

I'm searching for a while on this one now... I'm unable to perform a "ZeroTouch" Build & Capture of my reference machine to get a master image, with Capture Media it seems to be working, but this is a manual step...

While running a W7SP1 Build & Capture task sequence, the "Capture the reference machine" group fails at "PrepareOS". The step before "PrepareOS",  "Prepare ConfigMgr Client" runs without any issues.

The only error I can find, shows up in the report "OSD - history of a TS":

... 0005 that is either already released or we have not connected to it.
BootImage::ResolveImageSource( pszPackageId, sImagePackageSourcePath, sImageSourcePath), HRESULT=80070002 (e:\qfe\nts\sms\framework\tscore\bootimage.cpp,732)
TS::Boot::BootImage::StageBootImage(sPkgID), HRESULT=80070002 (e:\nts_sccm_release\sms\client\osdeployment\prepareos\prepareos.cpp,917)
PreStageWINPE(m_bDebug), HRESULT=80070002 (e:\nts_sccm_release\sms\client\osdeployment\prepareos\prepareos.cpp,1363)
pCmd->Sysprep(bActivate, bMsd), HRESULT=80070002 (e:\nts_sccm_release\sms\client\osdeployment\prepareos\main.cpp,270)
De-Initialization successful
Exiting with error code 2
sending with winhttp failed; 80072ee2
SendResourceRequest() failed. 80072ee2
Download() failed. 80072ee2.
Boot Image package not found. 
he system cannot find the file specified. (Error: 80070002; Source: Windows)
Failed to pre-stage WINPE image, hr=0x80070002
Unable to sysprep the machine, hr=80070002
Sysprep'ing the machine failed, hr=80070002

I've searched the smsts.log file hundreds of times for errors, nothing there... 

Can anyone give me a clue or just something...? I really don't know what my next step, to make this work, could be...

Thanks!