Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> bb3af0aa28dedd9d0c8239dd6419f53062cb5d8702db14cb3bebd8c3219834ea:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^