Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> b83aa9bca2ab3b685e9ee9bba755295c38a62db498e5404d05aec9553ff090d3:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^