Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> aa3cbbde737f6ec9c620d59d2c5ebfffd352b25a8e23cf4927a52a3ee4b99dcf:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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