Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b229917eae8d9f9bbdfea8d02a99f8617a92cb177c7680034091925818fb4d3c:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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