Instead of using the VIB-BITS extension can you try instead:
From the column in your project that you are using as the match, do "Edit columns -> add column based on this column"
In the transformation write
cell.cross("project name","matching column name")
Replacing the project name and matching column name with the name of the project you want to use and the column that contains the matching value
In the Preview at this point I'd expect to see something like:
[ [object Row] ]
or
null
The first indicates that a match was found
The second that no match was found
Alternatively if this isn't working OK you should see an error message in the preview
Let me know what you find at this point (you don't need to do anything further than look at the preview). This is to help understand if the problem is something about your OpenRefine installation or with the VIB-BITS extension
Thanks
Owen