Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 6fa586234783cf9d1e5bb44de5df8273b1a47782da07be56c136543f611c115e:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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