Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 608de9d731d583ce3d52e53dae0531f2080215858477d8fb476fbb572a80de02:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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