Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 26ffdf620d06bb360c2015ca90a56ae5ad6c05ba3a70b2e3c996c66dc7d5c574:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^