Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 693f50198de99f0729a3bed0af29440241bbbbcac6126314b1398e1db903e60a:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^