Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 750fe9a17941325265430cd17e2e42b7680f7b3ac99b7295de6a9397f72898f0:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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