Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 7a88d292a1be136ec96b1316c7448b44906c1ebc917b3789f31938bd4c72c00b:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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