Hi Ibrahim Imam,
The tfs build process runs normally with very restricted rights. It only can access the source directory plus some system resources. Even if you have the targets file in a different dir there might not be access rights.
You can give full access to the OpenAccess install dir to the user the tfs build is executed with or you can checkin all the stuff to your tfs. In the second case you are getting independent from the installations on your developer machines as well. I would make an OpenAccess dir, checkin all files from the OpenAccess bin and sdk folder, plus the targets file. Now make all paths relative and it should work.
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