Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> be2840856c4d45256659030005cbcb9b38263f7dbaa3ee4b710ce1b08fd367c0:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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