Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 621556ecad7ab3a5e3f7237e30b82c6a1fb6581a267d279e111ca55dbca8145f:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^