Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> aa67fd13a86fe07acb9fa501c298c7ef4524ce1e749d70252ffa7429ba1ff349:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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