Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 5318bd815882ea238fd42cb44c5db3ee17de8c695072918a4866200fc6d73079:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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