Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 7862de25fea6aeac1ac429b848734c81ed67b44f5c2b5ceab833f9c995f65df4:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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