Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 50fc131632990235e1beaadb01ce11e1ab365cedb3f52579c847749e593c065e:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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