Error with PHP

[agharaafat]

Hello,
i try to transfer from Kloxo-mr 7 to cwp7pro.
now i have cwp7pro with apache+nginx+virnish and php 7.2

after uploaded wordpress backup and restore it i got this error in all wordpress websites.

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Warning: session_start(): open(\\\\\\\\/sess_fd71023043d07f49877523683d5d3f00, O_RDWR) failed: No such file or directory (2) in /dir.file.php on line 62

Warning: session_start(): Failed to read session data: files (path: \\\\\\\\) in /dir.file.php on line 62

Warning: Cannot modify header information - headers already sent by (output started at //dir.file.php on line 1219

what's correct session path dir for domain?

and what's wrong with headers?

[bullten]

What is the path defined here /dir.file.php on line 62

Usually it is /tmp

[aidinmc]

Those aren't error, those are warning, you can hide warnings by this code:

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error_reporting(E_ERROR | E_PARSE);
also you can turn off wordpress debugger in wp-config.php , replace this code

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define( 'WP_DEBUG', true );
with

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define( 'WP_DEBUG', false );