Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> bf0e02ee763418b74d8f3bc7ab1381b784ef36e5c10df0c591b81fe41156fb5d:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^