Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c4cb6fbca38e535b4a3727b2b31450a11bd0736b5dbf47174b28f892f7b15594:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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