Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 0eb1b72f3a8c190aa0a7dd21c0dd4f52bad1f507aabaf1d029db93f5e79c8d05:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^