Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 158d9451a813fe4fde4f51e9119613825d6aa9199f15abce99156905ec80ea79:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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