Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 0e1543b5ed2ee208bd72cc1a2367642e40940eeb544289b423456f788eb573ba:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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