Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> a2a7cfbd1113076a149649de1baf23c073a66b2bfc394c8ff3432bc750cb6c74:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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