Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 2b7d3317d316fb9a02e9d1e8d652902d0151c46141e9a285eb46cb991f006e3f:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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