Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 4b320d7943f3a2104bd5bf544f6a8b284d9f42d78aec5f6bf2dc3adecf696acc:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^