I think this has been posted in several threads before, but just in
case someone goes searching groups for this in the future, and the
above solution doesn't work...
Instead of setting permissions, try deleting the model cache files.
They'll be re-created next time around with the proper permissions
automatically (much lazier and easier). They're in
/app/tmp/cache/models . They aren't read from in DEBUG > 0, so that is
why it's only happening with DEBUG=0.
I think I also read once that if the database table changes, the cached
model file will of course be wrong, and it can cause similar or other
errors. The app/tmp/cache/models directory holds the results of the
"DESC" database queries, IIRC. If you have $persistModel = true; for
any of your models, then you might also have some problems if the
permissions are off in your /app/tmp/cache/persistent directory
I once accidentally checked in the model cache files in my versioning
software without realizing, so for a while, every time I did an update
of the project files I kept on getting this error, as the files were
being replaced with old and broken versions! Don't forget to exclude
that directory from your project if you are using version control
software (cvs/svn).
