Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> bb3edfbff5f446e9ca7722db3ff8e239ad1c51f30088eeaf283051e3be39b7c8:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^