Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 702f691ec947ae80993d665d7ef5f3b29a8d439f15c9dea51412de9e80c06bcf:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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