I got this error when adding a custom field in the "Using frmula fields" when I clicked on "check Challange" I got this:

"There was an unexpected error in your org which is preventing this assessment check from completing: System.DmlException: Delete failed. First exception on row 0 with id 0013600000FR3MZAA1; first error: DELETE_FAILED, Your attempt to delete Test Account could not be completed because it is associated with the following cases.: 00001038 : []"

Anyone seen this before? Did I screw somethign up terribly?

I got this error when adding a custom field in the "Using frmula fields" when I clicked on "check Challange" I got this:

"There was an unexpected error in your org which is preventing this assessment check from completing: System.DmlException: Delete failed. First exception on row 0 with id 0013600000FR3MZAA1; first error: DELETE_FAILED, Your attempt to delete Test Account could not be completed because it is associated with the following cases.: 00001038 : []"

Anyone seen this before? Did I screw somethign up terribly?