Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 207497b1a4937a9c5b7f6ef69cbb89d44a5e5252ee2121737fff419b7d4784ef:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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