Z170x G7 Dual Ram Issue.

Feb 2, 2019
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Motherboard: GA-Z170X-GAMING7
Memory: CMK16GX4M2A2400C18
CPU: Intel Core i5-6600K Quad-Core 3.5 GHz

So I'm building the PC and when used with one stick of RAM in slot 1, it starts up with no problem. As soon as I enter an other stick into slot 3 (as it is the corresponding slot), it shoots me an Error C1. When looking up the error code, it tells me that it is a reserve code. Hopefully someone can lend me hand, if so, much appreciated :)