Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c13380fbce9fec5e29bc171d0f6c4b728407c6005811eabcd1891272bf9d6fd8:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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