Board Thread:Support Requests - Getting Technical/@comment-24741716-20151221132422/@comment-4731443-20151222065231

Could it be an OGX that was just renamed as an OGG, and Wikia's server is detecting that? If you didn't make the file yourself already, you could try to convert it to OGG and upload that new version.

Failing that, you may need to contact staff about it.