Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 4676b9d7c0b3cbdac6463ca9675329b1abdd51f8d4e07c6c5680f954b71da3bf:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^