All threads gone and getting error

[birdie]

This error has just turned up on my forum on every viewthread page:

Warning: array_keys() [function.array-keys]: The first argument should be an array in /includes/functions.php on line 3891
Warning: Invalid argument supplied for foreach() in /includes/functions.php on line 3891

I can not access any threads.

Anyone got any ideas where to start troubleshooting?

[Ace]

Which version are you running?

[birdie]

3.8

The error is only appearing periodically now. I have got on to host.

the vbAdvanced home page is now replaced with an error: "Invalid Page Specified"

- - - Updated - - -

Now the home page is back and all the threads gone. Each showthread page is getting the error: "you do not have permission to access this page" with this at top of page:

Warning: array_keys() [function.array-keys]: The first argument should be an array in /includes/functions.php on line 3891

Warning: Invalid argument supplied for foreach() in /includes/functions.php on line 3891

[Ace]

3.8.what? The functions.php file could be totally different.

3.8.7 = global $stylevar;