Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 7ec5a03c0c5a6046c3580ff66d83b29bd03a1f1365ec14c09c8ce1b87f880a30:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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