Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> e5e36999b4b8604a6d7d99fa792589f6c5845a48de97797875db02eeeb8e1189:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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