Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 3701bfca4e0059e97635f88fbf6ca71706707db71f06dbf4be7edc0fed8afe46:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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