Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> f0e8fba2e4302b24ac602adc2aa1bb9ab64f1d5b4f945bfd28f4b4256645f671:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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