Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> f794d10ccbb553bb2be13fcf3319da0e0628b7eb0b4cb601487d688e797f9ef8:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^