Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 9c24a07ba8a5cd27917a308123373da3e973c6eb093d4cb18f18cbfd5737f723:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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