Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 7af18e65839d9b33fde85f6283e9021d71f4ade48ea78d6b5f36ea54062b6ad1:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^