Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 8cbcc2a57cb29f700cf7e63587a93285c70981629ad65d07211b5bdc3168c5c7:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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