Failure to redirect

Hello

I have a big problem, many of my users tell me things like:

Failure to redirect

1 - It has happened several times that when I try to enter any forum post or in any section of it, throw me a screen that reads -----> THE FORUM IS SPECIFIED INVALIDO.SI you followed a valid link, please notify the administrator.
But if you then refresh the same page tells me that message, if you access requesting a beginning, and no failure has happened to me always in the same section or in the same post.

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THE FORUM IS SPECIFIED INVALIDO.SI you followed a valid link, please notify the administrator.

I recostruido forums and topics but the problem continues, someone knows that can be?

greetings and thanks

I checked your site and all your threads , forums are working fine here. Please note that youır site has disturbing number of adds including popups which makes impossible to browse.

Please, just tell me when you review and remove all advertising, thanks

regards

already removed all advertising