Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> d621e85c61d9b873154882c5aa89227fc4dd243cc8acd9ab9d6b8e737ef22b3c:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^