It appears that the cause was that I chose to prvent visitors from browsing the forum so if they clicked on any forum they'd get the error. Also when searching google and finding a page on my site. they weren't able to see it so they got those error messages.
Now I opened my forum to browsing of visitors and I am not getting any more errors.
Just wanted to share how it was solved in case someone gets the same error.
Haytham
Thanks all
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