Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b06e4c360c939b8b0718703a9f48da112da274892dd0adeb3a384b2a038ab64c:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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