Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 4e2fb102586634c8b32b45f119646a9b14483ff90a30bacb5cf46c04c37940a8:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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