Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 10acce41c0986d45ea05e255e31b81ec2035de9fccd0974d734e46a0b57a2e23:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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