Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 43d4f57e1d8f5904baec3c08f813b95905b5faff57a3c1549d4008048f58e64e:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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