Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ad02db001de6d9dc7978b5169b842ab7fcd695668167f4d1a646eba8b8eb235c:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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