Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 97ef479cf68c46a55b67afa9d19f94017c659c27541575ef87230e10cc43d03e:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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