Default "com.android.systemui has stopped"

Yesterday I rooted my phone and put on Xposed and gravity box. Since then I've been downloading various things and trying out different customisation options. The last thing I download was MotoXposed and I made my navigation bar completely transparent, when I tried to disable the effect my phone just came up with the message 'unfortunately the process com.android.systemui has stopped'. Now I can't use my phone and the message keeps coming up everytime I turn it on. How can I fix this? or get my phone working again?

Don't worry I've fixed my phone completely now.