Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 6d4c42e811222ed90aa5f0f7d0a769d88e43effe8032f0b2f975c0b3636db86a:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^