LG G4c boot error

Hi,
I tried yesterday to root my LG G4c (that I just updated to android 6.0).
I used kingroot. After I've done rooting kingroot said that I must reboot.
When I was trying to reboot there came an error.
The error said:
[580] -------------------------------------
[580]
[580] Boot verification fail!!
[580] - cause : MISMATCH_SIG_LEN
[580]
[580] -------------------------------------

Can someone please help!!
I am using the european variant in the Netherlands if anyone want to know that.

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