Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> b6ddf34bd093832c52bbc1f0e574406493a790c52e80d1ec70e2c2f08dd7ddc5:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^