Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 3b8ac27deb2593b5b5fc9dfbd2c3f6158172b35d4ab9e9fb7453a046213a1fc3:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^