Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 9c5720f4d2f8fc19ec873f068a9c4bf244e1d7ee4cbe2d5050a717f77458fd30:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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