Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 4766efdd8fb4f30d6a569e0b6e4133725a53f0a7480f3526bf9529d3df93ac4f:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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