Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> a0b5fb688ca2a3b59c9e218cd8cbb325225ae17527361d019448b66c0e14e1c6:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^