Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> fd1a5fd3b7f1765e949edd8d7157e75ec3711abee8496cf6502bad5cdfa3dca5:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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