Hmmm... less techy .... You are running some PHP code that didn't ship with vBulletin V3.5.x. This may be in the form of hack/mod or modified template etc...
This non standard PHP code is not compatible with the latest version of vBulletin and needs to be modified as per my above notes.
If yours is a clean install of vbulleting and has *no* modifications then you need to contact Jelsoft for support.
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