Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 32ab0fafd5b44ab27df999428b01afbce3e1dc1029c88b8c082eb7d4b552a885:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^