Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 0ea9b709e466f7b1bb89b85d1df82e61b3431090360da54b9471c84d27f3deb2:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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