Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 875ce05884a9902dc63311f3241d89905b3ba160f309193a21fe8ef161a80be4:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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