Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 76ebbfa54372b00d8dbd766c87ef135941ecb7f1a7d107ce892ceb63ece1b498:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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