Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> a7e793fbe2311abcc9506f6bb770659f38f20451375c32c1482bbf534778d244:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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