Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 4e336c5b37bb0367cabe8d3666a2e9ec88f2904e2f3db4d395be4f34f239d3a3:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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