Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 3ef7064c3b0e285795d3801edc8e3f25eadcd31de7fde4aaab8141c25cb18679:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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