Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 1dc6b3b6a028df3c3fdb3513d7297b7cef9b8e0a128893f19607d6d404bb873c:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^