Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 32786d015e1d4f5ea2d54dd105e6553bc3cfb281f205d311d69fd5f01ee6ae7f:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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