Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 73e5e110a7fb9551e92a869c00c6223f139029feefff30c3b07ac938acf1c4a0:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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