Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 8fd0b2f8118da03d1d60b2ff18d211571be8d5dab6593ae05e40bd14aaf5f43c:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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