Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> a0ad6a738e57ec2c4795e6d8e45389a853f0f9515576a0b9aca9250b8584fdf0:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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