Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 3b44c94dd112e6c0b8d716cac866c769c048680106efc1ce1e81befa6c0ff080:15:8
   |
15 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^