Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> f5f8e291a35f83c88f2269eaab26f3788d94e6116e56eab9b4946ec8d68838e3:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^