Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ea106a2d4f0b979f1c903b5bf7d2eb5c21d23ace2822f56d4b659678a3ec1a1c:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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