Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 462a3ca8e5c05e61c0ab24b0f9ff18390ccf0d1f884f9e44410f0cbee5136dfc:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^