[Trigger] Require help to fix this trigger and get it working...

• Events
  • - Time - Every 0.03 seconds of game time
  • - Condtions
  • - Actions
    • - Unit Group - Pick every unit in NOTYOURUNITGROUP and do (Actions)
      • - Loop - Actions
        • Set MEHPOINT = Position of (Picked unit)) offset by 90 towards (Facing of Picked Unit)) degrees)
        • Set MEHREAL = (X of MEHPOINT)
        • Custom script: call SetUnitX( MEHU, udg_MEHREAL )
        • Set MEHREAL = (Y of MEHPOINT)
        • Custom script: call SetUnitY) MEHU, udg_MEHREAL)

What exactly does it do at the moment?

I guess it's a kind of sliding system?
Can't you just move the unti to the point?

What do you want the trigger to do?

• Set MEHPOINT1 = Position of (Picked unit)
• Set MEHPOINT2 = MEHPOINT1 offset by 90 towards (Facing of Picked Unit)) degrees)

Set the points like this to prevent leaks.

I don't know if this is a typo or you have it wrong indeed in the trigger, but

• Custom script: call SetUnitY) MEHU, udg_MEHREAL)

The parenthesis looks in the wrong direction; do it like your SetUnitX one.

I think he wants something like a knockback system, that will actually move the caster towards the direction he is facing.
If so, the custom scripts should have
"call SetUnitX (GetEnumUnit(), udg_MEHREAL)" and "call SetUnitY (GetEnumUnit(), udg_MEHREAL1)"
Another problem I can see is that you overwrite the variables with different values. Use different variables or a variable with array to set the X and Y respectively.