Error trying to enter Custom Mapping menu

[Mark Stark]

I am getting the following error and I'm not able to edit custom mapping:
Map key Donated_Item__c not found in map
Error is in expression '{!fieldlistmap_8[cq.Object_Map__c][cq.Field_Map__c]}' in component <apex:repeat> in page cnp_paas:cnp_settings_custom_question

I don't know why this is happening since "Donated_Item__c" hasn't been changed in my system. Urgent help needed!!

[Mark Stark]

Org ID 00Di0000000eL4T, Access has been granted

[Mark Stark]

I have figured it out. The "Donated_Item__c" field had been deleted from the Opportunity object. We aren't using it, I will delete the custom question.