Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> de747173f33ecd36511de5edd108a8d4e1e96f5cdc57aa1141ba4276452414f4:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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