Comment to Messenger
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    Hello @Tajrebatee , Looks like Messenger's files were modified. If you are sure that you didn't change anything in core Messenger files, you can enabled in Sutdio->Settings->Site settings area option Force auto-update, even if some files were modified and then try to install update and then try to install update again. Don't forget to uncheck the option after installation. - 
    
    Thanks @Alexey. I am pretty sure I didn't change the messenger. And I already inserted the most updated version already. Do you think I need to uninstall and install back? will this fix the issue of "Push notifications"? (BTW: messages work well, but issue is that push notifications are not) tnx 
 
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