Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> cffddca6b86f40c30f1162a1222952be5e4adf1bd179b98f2305a7d5e252d5f1:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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