Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 9ef92803a09b936c2efb3a9b775f52415e5736f8d99e369d821ca7c8cffc369a:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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