Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 29ac36044eb24e1b52336efb4551463a4e7d8ab2a1f8eaa15cdf4d06d6e73668:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^