Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 08def5f551bf09d2bffb6a13ac04cbfd94cdb6bb0dd1edb41755b2de17fbcde5:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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