Lg flash tool gives contact system administrator error

I have a lg g4. To be exact a lg h815. I am trying to update to android marshmallow with lg flash tool kdz method. As soon as it gets to actually updating the phone, it just errors out and says to contact the system administrator. I am admin of my computer. I have no clue how to fix this. I even used a different computer and it still didn't work. I would appricate any help.

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