xbtitFM v2.1 Error: Tracker sending invalid data <NULL>.
 

I uploaded a torrent an my torrent client
wrote "Tracker sending invalid data ."

what the error logs are saying?
what about the query logs?

Generally speaking, that error is when the tracker returns data before its formatted with bencode .

So look in announce.php for a return statement or echo that is not bencoded and that is your issue.

yeah..

When i visit announce.php from my browser wrote error 500 internal server error. utorrent whrote Tracker sending invalid data . and xbtitFM counts seeders and leechers.

Usually you don't need to visit announce file..
That error 500 might be related from your htaccess file having some rules in it and you don't have the proper modules installed but this might not be relevant to your issue

if it gave you 500 error thats mean, it should be an error somewhere, check your php error log or mysql error log.

Nothing in both error logs.

How can I fix my htaccess file?

better use this https://erdgeist.org/arts/software/opentracker/ :)

Bump: better use open tracker on another VPS / DEDI and index torrent on another..

I want a private tracker, not an open tracker.