Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 8a85f9675f812864408a3ea3ba66c6eec566dec2791e0b4570de09d04069cb8e:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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