Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> a44ae0288b468992c9f15833a3411b5080d400a3a1c1f6751b54c53a0fa06234:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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