Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 50944a6a53e81a64cc2f09dda2a452c8a42e953c1a1676f35cb5cf02bff6881b:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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