Why is my phone saying that the SU binary is not installed?

A

AC Question

no SU binary installed

So I've unlocked the bootloader OK and then I followed this video - qbking77.com/development/how-to-root-the-htc-one-international-sprint-att ( I cant post the link as Im a new user) and when I open superSU I get this message - "there is no SU binary installed, and superSU cannot install it. This is a problem!"

Everything appeared to go ok with the root, so what have I done wrong?

I have hunted round these forums and seen other people with this problem but not with a HTC One.
I have also tried updating it through the play store but with no success, after the update the error message changes slightly to "there is no SU binary installed, and superSU cannot install it. This is a problem! If you just upgraded to Android 4.3, you need to manually re-root - consult the relevant forums for your device"

HTC One M7
android 4.4.2
originally on EE UK

Thanks
 

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