Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ee93fb56b6150295377bc05023eb6fa1fa035649edea606e18d0998cb414ce92:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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