Thank's guys!
actually, i forgot '.' when renaming htaccess file.
Now, it display error 500:
The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator, webmaster@um.es and inform them of the time the error occurred, and anything you might have done that may have caused the error.
More information about this error may be available in the server error log.
If you can't check your server's error logs then do it:
Please contact the server administrator, webmaster@um.es
Because, there are many reasons for this error
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Security issues should be reported to security@elgg.org!
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