Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> f7b1f2aea05db11c83d023dce2f6021d0e6ae975fe33e22ee82b154a99cb4a43:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^