Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b09bb771a39cfc4a8a9294902871629e6fc0ff8b520e99de3302c04476336f88:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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