Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> a1cda5dbdde10ef1b992fd51627366c3409a0e7ba33269033b13c6d29970c9f0:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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