Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 28b35570c9c99fc8c12c69679d01b9c5df1907faaa0b251e56bc2a5d1bf0549a:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^