Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> d7b7ba20ebefbf29a8682756bf40924111874812083892e337e56f4f36b6576e:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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