Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b1093b6d146c734651d329591c59196823b58a7ae77301c31a509f603d961ea1:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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