Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 3cdb3b56479c650bfa56533443b3d2530f169d6abda4b225b79666e736fa689d:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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