Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 1451de6399455633d9c9dc1bbdcb838d6c51ce3966c45321c4942c3bfe0acbc9:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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