Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 4a33e6fcf8bcd554b046f381cb4e4d9f2c56803f219676db7ee3617de32aceca:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^