Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> e3474cca52d2440cec45f2e656a7e6624246d0b42203ca93f4e0bd7621a0a2e2:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^