unity 3D expert only

I need an Android and ios app. I already have the source code but I am unable to fix a few errors. current issues are project player settings displays errors and the settings box will not load. I need this to be able to set up my sdk to be able to build project and test. I also cannot make Facebook app for access token without this Element working. there may be other issues down the line so this may be a small or medium project at most. I am having trouble setting up my sdk as I keep receiving return error of check sdk pathway for sdk tools. I have been through online forums and it is a common issue however i have tried downgrading down to java 8 which didn't work. I do not have the expertise to get past this point as this was a reskin project but has now became mote problematic. the code itself is set up for both android and iOS however the iOS scripts may need looking into further upon some investigation.