Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 3f5a69d3eabef4ea8cd7fdde4351169f3ef8747764b44738f545b4d111dc5c4c:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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