Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 4af0ffa6613235b2a5797fa2d6fd857b99928574371763d2da93eede8fb27faa:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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