Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 49f4ef933dc78f163fa26161f1046605e71be7fc88cb3cc7caf7c5b1a66772e4:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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