Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 0a449cf0094168591f0e1ba5e94cdd59f7346dd3f4b42d13d95f420140f44789:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^