Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 6fd41d4f7d95b4edbe0ef0dc3c13b891e47bbdcf5aabc6832632300f03e5715d:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^