Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 31109d8f01064e008881045be9e3ca1b9c3f4ec08cf95fa52693ef93c342e692:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^