Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 2f35ed3a4db5bba8cf8adf9779b1c16bdf5c9077a8f2dc7be3b7551e8234c945:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^