Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 44cc7452d1be33fb482af2484abb32efb0095b4d1bdcebc11a31de9648ed9901:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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