Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 34da4bce97110e2c6d62688cf1c2c36251506d68c8cabaa3259d396cc8e40925:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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