Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b0ee7471e7c4ba90dd7e0086fb55a959be03182a5f83d1baff407cab502da4c7:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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