Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 6de86940ae82220a9c767f21548c73cf0cc0ecfa341fd8e8ccaa2db8072c1cb3:15:8
   |
15 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^