Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> fc3bb4c2624dc86682a550f2500e0450cce1dcfda9e5150df86f41a7082074e8:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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