Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> d42434037cf6d91c11fa5a7d3ef10c2e2a309bfb29f501b0e8d01e339bafb407:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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