Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 099e8fdd4de23a793fb9773a6ae39ba138c25e2c6cacad1aecb2cdf67f213eeb:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^