Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b01e8174ad766198c144f7f8b626d6d99857c10cb5d0d2998cf0d159d22894a1:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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