Terry,
I do not know anything about BackupExec. However, if you follow this link you should see 74 results from a search of "Unable to attach a resource" of the VERITAS Knowledge Base.
http://seer.support.veritas.com/nav_bar/clustersearch.asp?SrchPageID=techsearch.asp&crumb=&highlight=on&SearchArea=All&rc=25&display=&SearchTerm=Unable+to+attach+to+a+resource+&ddProduct=BEWNT&ProductVersion=BEWNTPVER16648&ddOS=&method=and&group=on&show_seer=1&show_pdf=1&include_techfiles=1&show_news=1&search=Search+Now
Perhaps you will find a helpful post from the searchMessage was edited by:
Bob Stump