Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 2e7eb4035bb578c4ad9ea82856c88ff9a2ffc86a4dfa6bf1efbe33d75cdae2bf:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^