Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 4adaac493914737d816fa8bb55c1a9ef7ab9a782dfdf8f254c70f83742611a7d:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^