Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 8a6f11321905dbdfe54b02d2d62439bae948ca5ece714153607e9d7cd8e5dbcf:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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