Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> c984250ac7f6ce9060cf3aaec58abcf722976a8ffa3fd12c83a1da5f2c2f314d:15:8
   |
15 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^