Could not load type 'Microsoft.VisualStudio.Performance.PerfWorkItem' (Beta 2)
[151 byte] By [hyslopc] at [2007-12-16] 
Some folks on private blogs were reporting this error as well and they mentioned that it was related to not installing TF (Team Foundation) client.
Moving this thread to the TF forum for their confirmation.
Thanks,
Ayman Shoukry
VC++ Team
AymanShoukry at 2007-9-9 >
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