Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 756e0feac8d002eb22474fb25ef5f21e3659ddf7339d50efe77cd0cc04bcadb1:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^