Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b0313fb783f1f20e46953b7ffaed97e6e6e617aa00a2316fc06af097484a1c30:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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