Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 6be54c2639fd115853e7f95fdd553f60cf7de88b20d79c2f45eb1f23cfbb8cea:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^