Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 1f2cec95a745aecd35ab0d1a37b856d622b76e3c1cb04f8ee4f55de0e63b4f95:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^