Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> bfb3fbb0b28e584734fb1f6051ca697779a772e44dbbb85352362ce74bbab56a:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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