Give better error message when a class is not found
Give better error message when a class is not found

git-svn-id: fe2f45b2405132b4a9af5caedfc153c2e6f542f4@696 95a46c32-92d2-0310-94a5-8d71aeb3d4b3

drnlm/sqlobject,sqlobject/sqlobject,drnlm/sqlobject,sqlobject/sqlobject