i can t enter my site

[aycan.naime27]

hi

right now i m getting the error below what should i do? i just installed a package on my smf forum...what s wrong?

Internal Server Error

The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator, no-reply@x10hosting.com 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.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

[descalzo]

cPane-->File Manager OR FTP

Check file permissions. Make sure they are 0644 (0666 or 0777 will cause that error).

If that doesn't work, check any .htaccess file and make sure you have

RewriteBase /

at the top.

[aycan.naime27]

if i don t have RewriteBase / at the top will i write it by myself?