Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 7ac3473be45884fb38048861473599a820ba3e10daa2adb507338a6ace4a14a5:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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