Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> fed6192ad70b76d4245f4cbc781d3d14771eeb60a0992305fd6cc355110678a7:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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