Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> e4f189ed15770b797c72161a23da8b6a805afbba901fd5dc13722d223c885d6b:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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