Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 5afef510da1b2349afc99a328555b66abbf016348fd964ae2da8df061bdb348e:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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