Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c71bd841bab0348e1f812aa748beea66736c375bb1ca800b1253ed4ac80ea5fc:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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