Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 3f83b386e2436c0bcea715b5d6e2fabf23a330172e70d0373bce61458749b8b9:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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