Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 8497c77bccf8ce55abf7b205ebcb48c85cd3f5ea2c6480aa6d54cca5a6c8b432:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^