Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 98a9543d95070ac9813e0340d2ac29265fc2350b309141e3fe6c1b22114bafea:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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