"Taxonomy Error

[rambb1]

I just finished setting a new site and went live this week. I’m now getting an error within my bbpress forum that reads, Error: Taxonomy isn’t defined”. What do i need do in order to fix/make this message go away?.it is only shown once you select a topic to view,at the top of the page, following the title of the topicl.
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[Locked as not related to Qt ~kshegunov]

[JKSH]

@rambb1 This is a Qt forum, not a bbPress forum.