Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ce66f2dbf3699c36193eb465ef3322dfd9210d14cc94859ac481d00d2fd15517:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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