Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> b8a5b6cfb66a83947bfa9ea9699d55e6e8ef6d7c62c5e428a79de5ad5a34880f:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^