Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 101f0d0471be6a1f5315937012164a924c523c5365814629ab47d07d09aa4561:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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