Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 908f9c3d959fe38f455e213a54b38c5bfcaff4f7fc8d592052c00208bb070fdf:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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