Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> f8832824a45b01db01db51544c2d69b68dcbcc897c2c1dc6936a209e90b1c04d:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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