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Why Am I Receiving an Error (2021307694-56380 (-1442955710)) When Trying to Create a Master-Detail Relationship Field?

Knowledge Article Number 000205616
Description When I try to create a Master-Detail relationship field, I get the resulting error (or similar):

An Internal Server Error Has Occurred

Error ID: 2021307694-56380 (-1442955710)
Resolution This can occur if there are soft-deleted custom fields.  Clear out the soft-deleted fields and it should resolve the issue:
  1. Setup | Create | Objects 
  2. Click the name of the custom object
  3. Scroll all the way down the  Custom Fields & Relationships section and click "Deleted Fields
  4. Delete all the soft-deleted fields.
The same error can also occur when creating lookup relationship field.

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