You have to add a few fields or indexes (depends on the uddeIM version you have run before the upgrade) and the upgrade process is described step by step in the README.
Second:
You have not upgraded all files. When you do a manual upgrade check twice if you have copied all files. When you are unsure, uninstall the old version and reinstall the new one. Also this process is described in the README.
uddeIM & uddePF Development
CB Language Workgroup
CB 3rd Party Developer
we had been happily using the message system and just 2 days ago every one got this message. Either something spat the dummy or some how something was deleted by external forces.
I recovered from a hosts mysql backup. We are happy again.