Fix a Wordpress bug

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Job Description

I need to fix this error on my wordpress site. The error reads as below.

Fatal error: Cannot redeclare xmail() (previously declared in C:\Inetpub\vhosts\oschool.com.sg\web\tbg\wp-includes\pluggable.php:1) in C:\Inetpub\vhosts\oschool.com.sg\web\tbg\wp-content\themes\TBG\functions.php on line 1