Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 55bc3c4b76b8d25e450864420eb5b58d11b2d3e0d4f9b0dbab1d6f38fad00073:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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