Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 84a2d2aac548ae7652157836e8980ec941d2cec207bf9c602316f268898a24b7:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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