Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 4e2c1658f69b2b20fe00bd2cfbf787ab29b704d4c2ddf55f2f9be1a7311327e7:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^