Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 8ea0cb82034f7e730255a0d4750596eb173de68f883b8f7a280643031b8a8749:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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