Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> d6ffab89aa40d5e4d0d7d71486f88d9ef72241a8a20d0056f33aeabd8d600fd3:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^