Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> db7dde7321e5ca3f71449f4495a60bcc2c519db2095379f47e2dc85ee9aa1c81:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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