Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 6e1ac0559c730aa5e3e6d829a1523f335e87f640e415eb6266a693357a9b2fe0:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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