Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 892a0fa04ebd2f4bfc6a1dda7b42c62cbb5fef489f5d2aab50314cfd19985d92:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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