Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 826a78382414e0a1b6b7c45a9f38fd9eee7dd68ce4fd95a19dffb3aba20946f2:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^