Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 9dba7e3a893bca65dca99c34aa3c73608f9d97f88961e46d1d423d424c56465d:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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