Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 123e4c240f9901621681fa77c1ff7cf6e0ddcf104179e8c4c73cf2af6d3b70c0:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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