Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 28ed5d5515d33cfecc4de35548f02de8c68037a992bf152c82806d98b8be49f7:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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