Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ef741dc287c91d5cefef6fa1bf4610e80c9acfeea2ba1efefe7000886ebc4e11:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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