Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> febab01f0e6d97e9e3595b130027e2823e6dd257eb99cb99cdfdee80ffe800a8:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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