'Everquest cannot find the zone file'

[Wokchop]

Hi all,
I have had similar log-in issues but have most of them sorted. However, when I get to the character select screen none of my characters are holding anything in their hands.
Clicking 'Enter World' the game looks like it is loading but it crashes out with the following message.

'EverQuest cannot find the zone file 'cauldron' (or whichever zone any of my characters are in) in the directory that you are currently running EverQuest from. Please check and make sure that you do not have more than one directory with EverQuest installed.'

I can only see one EQ directory /Sony etc and the names of the zones are in the EverQuest dir.

I would very much appreciate any suggestions.