Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> db0e20e7a245f041ac19a653dcc93e7b6801cf6b6fdbc358a06e5bda64521615:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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