It looks like someone attempted to upgrade to 4.0.6 but didn't upload all the files... your style is clearly 3.8 but your database is 4.0.6... I don't know what to tell you- you need to figure out what happened- who tried to upgrade and what did they do? Do you have a backup you could revert to? As a last resort option I would maybe try to upgrade, the right way, from the start- first by uploading all the 4.0.6 files over your old ones and then running upgrade.php (again). But I really don't even know where to start with something like this.
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