"We can't display this page." error occurs on the Lead Field Mapping screen

Please follow the steps below to correct the inconsistent field settings:

Step 1: Identify and Restore the Deleted Field

1. Navigate to Setup > Object Manager and check the Fields & Relationships for the four related objects: Lead, Account, Contact, and Opportunity.

2. Click Deleted Fields at the top right of the screen to check for any recently deleted fields.

3. If you find the relevant field, click Undelete.

Step 2: Remove the Field Mapping

1. Navigate to Setup > Object Manager > Lead > Fields & Relationships.

2. Click the Map Lead Fields button. (Restoring the field in Step 1 allows this page to open without the error).

3. Locate the mapping related to the restored field and clear or remove it.

Step 3: Re-delete the Field

          Once the mapping has been successfully removed, you may delete the custom field again if it is no longer needed.