Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> aa9fc9ff6210a18e8953748f49579f5ea634b228b3703a0287af263bed49a216:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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