Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> eebc26bd1832a8a1fcf9f928c6314ac2cda56e0c63bdd08bc82b60e99eaa30f0:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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