We could not complete your purchase - Unknown Error

When trying to update my apps, I get this error message:
We could not complete your purchase Unknown Error.
I've been getting this error for a week straight now.
I uninstalled some of the apps thinking that something was just corrupt, and now I cannot reinstall them (or buy any other app for that matter).
The authors of the apps no longer offer downloads from their individual sites so I'm in trouble here. I have to work tomorrow and I have lost the entire night trying to fix this. I have tried everything mentioned on this forum (signed out, reset safari, cleared the app store cache folder) and now I can't even sign out of the App Store. I click the "Welcome (myname)" and "Account" links and nothing happens.
I even tried restoring the system, but the last step said something like "you cannot update mac osx lion server, you must erase the hard drive first." But I didn't know I had OSX Lion Server. I just bought the Server app awhile back thinking it would let me deploy a MAMP development environment and then deleted it because it was a joke of an app.
So am I screwed or just missing something here?

Many Thanks for the info zkc75 it worked for me.
This if for those who dont know how to delete /folders from /var directory.
On Finder select Go, then Go to Folder type /Var, hit enter. You will now get to see all folders under /var.
Delete all the folders under folder.
Thanks,
Narayan

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