Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> e73e9a5d881bbd1260ef73955f31f25b04e801ec2d01a9a26c5fff0330d34516:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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