Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> a38b7b3947a88741cae3fc477a75cc4978e5b1297b4f6dbd1be3fd615b96cb36:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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