Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 8d80e6c15d645d4ad6791ab35573b906a760efa47a320ecbf2083c27032c6f71:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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