Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 61e4acccf036dae381fdbf10209f63cb67b03d15f3437c3d2b79fef283ba8c39:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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