Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> faf56f58256e502b721e35fd77ac77a04127d74e738158d91fbcfb6a1a03e3d0:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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