Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 4f4d0fecab6e6b9aa26c84921c162bf401dc78ef92091d34fbdac720a7e0221b:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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