Can you please tell what this mean error on php

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Hello can you please tell me what this error means?

support theme don’t want answer or tell me what this mean so I have to investigate myself and how to fix it?

I have errors:

PHP Warning:  Attempt to read property “widgetType” on null

PHP Warning: Undefined variable $output

PHP Warning: Undefined array key 0

I simple don’t trust support they maybe did something on my server and now dont want to fix it

 

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