Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ea5542b683203328df3f2839107f8a1f09642241999d75c06335380f503bdc5b:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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