Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 85407edba354cdf665a5aad82e2e331b288351cbd35135ca78145a0fe676240b:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^