Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 23001b0725363759c4f9d34bee74aae5db64e105b1b38598b19bb5bb079897b4:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^