Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 8d817729bbeba96b050a02d8e5e3718bb28a64cef20e68cd4fb776411e6e5dec:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^