Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> db086844026517ad8da6fdf020fac9e59167d3f47b847be7577b5b1e4f83fad1:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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