Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b64cd4226b3222b29b3489264322cd0cf538fc1354b3fad17d84da5a50259dc9:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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