Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b2570ec0769f1effaeb580790d23f07f4f9cd742bc7eeea7fe5c4404a080182b:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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