Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 424500ce1e4f241bbb92e757e4a6342b8cd3e43401602243c3f0a8b8e1c0f9fd:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^