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The reason for the error should be visible in the error log. You can find it in your hosting area. If necessary, the support of your hosting can help you.
Alternatively, you could also enable debugging in WordPress. How to do this is described here: – also here the support of your hosting can help you if necessary to edit the file accordingly.
In both cases you should be able to see what the cause is in the logfile.
here is the error log below, i can’t understand it
Unfortunately, I don’t have access to the one at the link.
Anyway, I have solved as you suggested to check the error log, i turn on debug on wp-config.php, and i found issues related to plugins and I disabled it and it’s work for me now, thank you