Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> af8bef446b1963fa2064831a9b1a3489cee349bd6484d69d878c800d916a8129:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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