Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b066df3406185f248e65b74ced0a639b7973a036459f9e4968e99af053a88bf1:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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