Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> d79948274970b66699c8ef1de60bcc4bd76d35328d9f33316cdb80cd2335573b:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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