Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 2e1d849f65ab691f5fe65804f04e4d57c866d12d83d0e9ecdd1c582d92b54ed4:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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