Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 49290bf784b2c52d37ca0b27ce8456a9c1d61fdc1ff626c0ba9bc6af6b37f3b0:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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