Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 34b42bcb1de165e6ad352191c2e433905a0af1aaf6b64d302b6b4f51f25afcb6:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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