Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 282f81456fe0aa52af0de7e1c72cbdbc680ea1aff0e80d6b03cefe945855ab74:15:8
   |
15 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^