Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 775daffc7a8c1d4231d191af4fd11c8fbe2726a58183c985ad931a0f7b463914:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^