It seems that it's a problem with
/includes/class_activecache.php which is
NOT a vBulletin default file.
Firstly, I suggest you remove the non-default files first. Listed:
- /admincp
- /images
- /misc
- vboptimise_bad.png
- vboptimise_good.png
- /includes
- /xml
- class_activecache.php
- class_activecache_methods.php
- class_activecache_vbadvanced.php
- module_blank.txt
- /vboptimise
Try this and let me know if this resolves your problem