Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 023e30daa0f3ad1c3ed451dcbf53b59661eba122cd8be21aaf89b3f2869605eb:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^