Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 5de83539b8f107e3d83d06d8771876b06837c9968dc3bc38ad1ff035caff8d7d:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^