Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> e3973ff4989e3eda3af0f53a7c007c34274e502fc08f384802bc8061fae420b1:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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