Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ac04aea3ea0d3d73a150c450bb94006360db5268d0b7db38498e37bccde3804a:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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