Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 335be35ba1f58b7f0c001eeeb731dfaf355cd7877db4a36f6f2ced2fac47b80f:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^