Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 99b7b6405589f15c03b47841175d91e94e7729e402bc237ad187a1c819e7a204:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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