Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 980fe89999e86e8dd48c6c83cb894d924ff295f527bb3053818a71d5a92feadf:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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