Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 0ec5ce68d0d16ae80fd81cf156c2322f19d8ef539d4fa2c9e948105017f822ed:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^