Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 2f025ce73de4697bd744c5b34b28443a8ff813587123bdcc38af1e443cf3d816:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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