Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 0401a10ffb67d8a9802e163635545192cd344dfcc0ff13a483662c474da3b1bc:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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