Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 3ee41b4c5877c2839aea657b53acd4488b507b6988afd266e2c37f89613b87b1:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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