Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 651c907ae54c23a5a54fb6eec5e5ccc9a77889c6026a71b8a20f9782d2d89a80:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^