I've had the error "A parser error has occurred" (with event ID 1319) a couple of times when working with SharePoint 2007 - especially when moving content between different farms (e.g. backup and restore). In my cases it has been missing solutions (dlls and libraries) in the destination farm that has been the cause. Last time Ajax runtime and what missing in the destination farm, and the parsing could not be done.
It is therefore very immportant that farms involved in a backup and restore scenario is 100 % in sync bfore restoring a site collection from one farm into another.