This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
There are a few things to check for an error like this:
1) Does that table/object/trigger/whatever it is actually exist?
2) Does the user querying the database have access to it?
3) If it is a stored procedure, does it need to be recompiled?