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Well I'm not sure why it appeared before then, as I didn't upgrade a beta version on Wamp to final version. I did a clean install using XenForo 1.1.0 final. But anyway, I opened another config.php back-up I had in an archive wamp backup, then copied the file cache line entries from that and pasted it into the other new config and the error has still not popped-up again since.

 

So I must have made some kind of mistake when first adding the file cache code.