Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 02c934e63c1c3319d46d768791fef8b0548214b4fa734c483de783f66cda1aed:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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