Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 970f19fe0cc41854091b3522ddc3da5828a06c34630dd058830b42f492ee4d67:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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