Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c25f2f8f159b69f87b351f1f115242ba331c31328f0e9416f5fa713aa12dac27:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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