Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 0fcbf7b7fd6e8843359c19fcc77a7ac34d60864af4ac844f0357fadd1e9973f6:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^