Hello Vasilli,
I would really advise you against moving 5500 on a live site without having a backup or a dev server/site.
You have to make sure you have your permissions and log/tmp folders set up correctly.
Also I am assuming you are using J! 2.5, 3.0 or 1.5.
Finally checking your error_log might provide you with some insight of what went wrong.
PS. always backup first.
JoomlaWorks Support Team
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