Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> a0f072d881c1d607f802d641cc7cb9d7b841067fe9b66a8a03aa249f5e0d7339:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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