Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 1494c02ccc03d0c964d01c5041095e4845f781fad65b2c26eac8a17e80f5c2b6:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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