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I encountered this error recently and while WordPress was operational, I could not access the admin dashboard.
The resolution for me was to access my CPanel / file manager for my WordPress back end and rename the WP-Content/Plugins folder to PluginsOLD, which effectively disabled all plugins. After this, I was able to access the admin dashboard and then one by one move the plugins back into a new Plugins folder until one broke the dashboard again… and there you have your problematic plugin!