Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> d06794f90d1596ba1f1735d799391b064e3d10dc1eaf342bdee5bda82ec92030:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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