When I go to Magento admin,it shows fatal error. This is the screenshot of my error

enter image description here

Please guide me how to get rid of this.

  • In which Magento version you get this error ? – Vignesh Bala Nov 27 '18 at 7:34
  • Did you created any module recently which uses observer? – Sukumar Gorai Nov 27 '18 at 7:37
  • magento-2.1.... – Lovely Setia Nov 27 '18 at 7:50
  • Yes, I will create module for change custom price of cart item through observer @SukumarGorai . – Lovely Setia Nov 27 '18 at 7:51
  • Can you disable it and check? If it works then user the events under frontend. – Sukumar Gorai Nov 27 '18 at 7:59

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