Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 54f7a7026a9f44fa048d2015160286f982675e68919969e936b4f4b2e803002f:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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