Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 2689610a241ce8487a8f74bc5a6518667c2d2f7872485974e5ab2757a046296a:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

error: pre-condition failed: listing has already been purchased
   --> 4eb8a10cb9f87357.NFTStorefront:243:16