Plugin is attempting to start a session with WordPress. WP Session Manager will not work! DomPdf

I get the error message Another plugin is attempting to start a session with WordPress. WP Session Manager will not work! how to find error

I am trying to correct the code of somebody. He uses dompf. There is stuff like $_Session in the code. What do I need to do with the code so there is no error anymore?

Topic session Wordpress

Category Web

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