Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> efd7c9dba52575e881851e38a6e05df4831c32156fe3f5d05be5bea0663ba777:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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