Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 827da9a32669c0bda9a92fda42c22bc1c9330ed65f37f0f8bc7e3154d8f4e8b6:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^