Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 2a93c19acdb0c305d08a7d1c048c91ce22b4c074e77c5eb79cfa2b1275ca5301:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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