Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 4b17d6bc2d8bb293439e0562919cb1efe10d567b2e12d01ac862bf775b2eb065:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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