Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 1601e846f1a45fffabf01a4ffb12e58da65b6622822fda9ead8a312c3d4bdb9d:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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