Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 6f2f9e523a36e1b4f7c73683739e5a31034cdd04025c064dc8a7bdc0da7ef961:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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