Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 39ecc748d6a08124aad17b02b859ed856199255456334967f88831693eb54e5c:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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