Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 3eaec3c0f8b62c67ba8ba185e048daa7223c4c708fa73ea23e4fad587b38356e:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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