Stumbled on an obscure problem. Posting this because my searches of stack overflow did not find my answer. Hopefully this will help someone else.
My reporting services report will compile, but at run-time provides an error along the lines of:
[BC30456] 'RdlObjectModel' is not a member of 'Reporting Services'
This happened after I copy/pasted an entire tablix over from one report to another.
After I reversed the change and removed the tablix, it worked again.
The original report with the tablix I'm copy/pasting works fine.