Fatal error (include_path='.:/opt/alt/php54/usr/share/pear:/opt/alt/php54/usr/share/php') in Unknown on line 0

     

It is my shared hosting running 3 websites. Just from yesterday all of those are giving the same error.


  

Fatal error: Unknown: Failed opening required '/home/user/... ...   /index.php'   (include_path='.:/opt/alt/php54/usr/share/pear:/opt/alt/php54/usr/share/php')   in Unknown on line 0

  

I have changed nothing during this time.


I found some answers about this error but they are mostly need root access to settings. I do not have root access. Please suggest me what can I do.


Note: the public_html folder has permission set to 750