Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 986335d720a2b9f2e8a3a249d77a7ca12550071eca4d1b1261906f1e65b2c60b:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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