Question

500 internal sever error. I receiving this error many times ?

Comments

Do you have some error logs on your hosting? If you are not getting error messages on your site they will most likely be in some log files somewhere.

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where?
I am not getting it.
can you tell what to do ?

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Warning: session_start(): open(/storage/ssd5/513/2620513/tmp/sess_m0i5vjelnru05igmnbmhbji5h9, O_RDWR) failed: No such file or directory (2) in /storage/ssd5/513/2620513/public_html/qa-include/app/users.php on line 146

Warning: session_start(): Failed to read session data: files (path: /storage/ssd5/513/2620513/tmp) in /storage/ssd5/513/2620513/public_html/qa-include/app/users.php on line 146

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That sounds like some kind of server problem with PHP sessions. You should ask your host about it.