Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> f2dc37a20eddaee17c493cc05e44cbe574d00474bc0d4ce08dae1b1fe75c2526:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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