[BUG]
Error on startup and not entering my Pro Controller
See the end of this message for details on invoking just-in-time (JIT) debugging instead of this dialog box.
************** Exception Text ************** System.NullReferenceException: Object reference not set to an instance of an object. at BetterJoyForCemu.Controller.OutputControllerXbox360..ctor() at BetterJoyForCemu.Joycon..ctor(IntPtr handle_, Boolean imu, Boolean localize, Single alpha, Boolean left, String path, String serialNum, Int32 id, Boolean isPro, Boolean isSnes, Boolean thirdParty) at BetterJoyForCemu.JoyconManager.CheckForNewControllers() at BetterJoyForCemu.Program.Start() at BetterJoyForCemu.MainForm.MainForm_Load(Object sender, EventArgs e) at System.Windows.Forms.Form.OnLoad(EventArgs e) at System.Windows.Forms.Form.OnCreateControl() at System.Windows.Forms.Control.CreateControl(Boolean fIgnoreVisible) at System.Windows.Forms.Control.CreateControl() at System.Windows.Forms.Control.WmShowWindow(Message& m) at System.Windows.Forms.Control.WndProc(Message& m) at System.Windows.Forms.Form.WmShowWindow(Message& m) at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
************** Loaded Assemblies ************** mscorlib Assembly Version: 4.0.0.0 Win32 Version: 4.8.4250.0 built by: NET48REL1LAST_C CodeBase: file:///C:/Windows/Microsoft.NET/Framework64/v4.0.30319/mscorlib.dll
BetterJoyForCemu Assembly Version: 1.0.0.0 Win32 Version: 1.0.0.0 CodeBase: file:///C:/Users/Owner/Desktop/BetterJoy_v6.4a_x64%20(1)/BetterJoyForCemu.exe
System Assembly Version: 4.0.0.0 Win32 Version: 4.8.4200.0 built by: NET48REL1LAST_C CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System/v4.0_4.0.0.0__b77a5c561934e089/System.dll
System.Net.Http Assembly Version: 4.0.0.0 Win32 Version: 4.8.4084.0 built by: NET48REL1 CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Net.Http/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Net.Http.dll
System.Core Assembly Version: 4.0.0.0 Win32 Version: 4.8.4270.0 built by: NET48REL1LAST_C CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Core/v4.0_4.0.0.0__b77a5c561934e089/System.Core.dll
System.Configuration Assembly Version: 4.0.0.0 Win32 Version: 4.8.4190.0 built by: NET48REL1LAST_B CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Configuration/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Configuration.dll
System.Windows.Forms Assembly Version: 4.0.0.0 Win32 Version: 4.8.4270.0 built by: NET48REL1LAST_C CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Windows.Forms/v4.0_4.0.0.0__b77a5c561934e089/System.Windows.Forms.dll
System.Drawing Assembly Version: 4.0.0.0 Win32 Version: 4.8.4084.0 built by: NET48REL1 CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Drawing/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Drawing.dll
System.Xml Assembly Version: 4.0.0.0 Win32 Version: 4.8.4084.0 built by: NET48REL1 CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Xml/v4.0_4.0.0.0__b77a5c561934e089/System.Xml.dll
System.ServiceProcess Assembly Version: 4.0.0.0 Win32 Version: 4.8.4084.0 built by: NET48REL1 CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.ServiceProcess/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.ServiceProcess.dll
Nefarius.ViGEm.Client Assembly Version: 1.16.150.0 Win32 Version: 1.16.150 CodeBase: file:///C:/Users/Owner/Desktop/BetterJoy_v6.4a_x64%20(1)/Nefarius.ViGEm.Client.DLL
System.Numerics Assembly Version: 4.0.0.0 Win32 Version: 4.8.4084.0 built by: NET48REL1 CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Numerics/v4.0_4.0.0.0__b77a5c561934e089/System.Numerics.dll
WindowsInput Assembly Version: 6.1.0.0 Win32 Version: 6.1.0.0 CodeBase: file:///C:/Users/Owner/Desktop/BetterJoy_v6.4a_x64%20(1)/WindowsInput.DLL
************** JIT Debugging ************** To enable just-in-time (JIT) debugging, the .config file for this application or computer (machine.config) must have the jitDebugging value set in the system.windows.forms section. The application must also be compiled with debugging enabled.
For example:
When JIT debugging is enabled, any unhandled exception
will be sent to the JIT debugger registered on the computer
rather than be handled by this dialog box.

have you installed vigembus drivers?
have you installed vigembus drivers? Yes, I installed it. What do I do next to make it work, or how do I remove it.
This also happening to me if you manage to fix it let me know how you did it.
Same
I had the same issue. After restarting my pc for the install it started and I just had to reinstall the driver and relaunch Betterjoy and it fixed the problem.