Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> bd70f0f685d60c0e16fe436c3e238327d995691be2dd1843512b0c3a3b3fd2bb:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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