Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 0b98d4993f0a0d4ba94ffc7d9237d761a183f95bab4c6f67eee3d4d7ab438f55:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^