Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 7ff4df827388892c6fe14935bd8bb536813b22d82f2a75f8b2132681c4e96bf3:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^