Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 21b7267a6f5e6a8171b6cf95c203a3f440359a34984b0f682ce958e9fa6b254b:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^