Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 989b962a2ec960bd4fde3c32b9e5c726f23a534a38783e4087c9588038a3e316:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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