Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ce091e1bbfeafcc794f4c2b3a3223da9b20e3dc19379de7914e81e5d7e3973fc:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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