Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 4e52e98b2abad805926b46fe185a0bb8da8dfef75e54a18b91d2a605d296008d:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^