Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> b15fff7bf7975c1ad975fe8e66fef2e3dac64fca967293bce9acf0304a181519:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^