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Why the above error occur when I tried to login to mediawiki?

I have session_save_path("tmp"); on my localsettings file.

And when I look at the php error log, it gives me the following error PHP Warning: Unknown: open(tmp\sess_2084135d01d2d5c360ea28b255310cb7, O_RDWR) failed: No such file or directory (2) in Unknown on line 0 PHP Warning: Unknown: Failed to write session data (files). Please verify that the current setting of session.save_path is correct (tmp) in Unknown on line 0

A tmp folder has also been created in my wiki directory.

I am using IIS server.

Thanks all!