Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 866ac57885a542eb15a057f8a76e3e7b6188d8d488dbdfc896b63140286981b0:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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