Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 263fb0359d9d0f83be44f310efc54c9deaea10fa2cc7cba5ab9abe932b5bde11:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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