Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 006cf532f68fce696bc78261d53c03ce7983fcbfb9b3866aa707658e6b3a4c11:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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