Thank you Jalal, for your response, but I couldn't (or better to say don't know how to) do it? I tried to do as following:
1- Go to Host >> Host Settings
2- in Advanced Settings -> Performance Settings, I clicked on link { Clear Cache } , the problem hasn't been solved
3- I clicked again on Clear Cache, and then Update , again nothing happened.
4- I click Clear Cache, Update, and then Restart Application, again nothing happened.
I look at Wiki module settings and notice there is no module-cache setting, so how could I clear the cache information as you said?
Thanks again.
Jalal El-Ali wrote
Saeed;
you could as well delete all the cached information in the database, this will recreate it all the links nicely.
J