i am install successfully sitemap module and working awesome everything working fine but i am change few option then my board show only i am forgot which option i was change now i am unstall the module but result same please help me urgently.when i am install it my board does not show why?

It could be because of some change you would have made to your template files that only showed up when the cache got refreshed, in case you're using some template caching with phpBB2. Anyway, I don't think it is due to GYM.

If you have a working backup, you could compare it's files with the present ones, using winmerge for example, could help to find out where the glitch is.

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my friend was a problem similar to you,he checked all gym installation and it resolved