HTTP Error 500

I am getting an error while login to my admin page. I have identified the below error. Please urgently help me to resolve this issue

Fatal error: Uncaught Error: Call to undefined function wp_is_recovery_mode() in /home/vol3_3/ Stack trace: #0 /home/vol3_3/ include() #1 {main} thrown in /home/vol3_3/ on line 55

this may helps you. this error says some files are removed:


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