Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 8204beb108ede749a28702d035b3475bdac55eeeb04b71748604a205370819b5:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^