Hello You have not specified the correct table prefix for Vbulletin when you installed Photopost with vbulleting integration.
This prefix is stored in the photopost mysql settings table entry number 83
UPDATE pp_settings SET setting='vb3_' WHERE id='83'
Just an example of a way to fix it if you use phpmyadmin. Now note change to the proper photopost table prefix and the proper
vb prefix if yours are different