Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b1a1488e2d6643a03d8148067514c4a429534848bdfdbc05db9caf9b58584948:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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