An exception of type 'System.InvalidOperationException' occurred in Unknown Module. and wasn't handled before a managed/native boundary

[mrusme]

As soon as I'm adding those two lines in the public App(), right under InitializePhoneApplication(); I'm receiving the following output:

            ThemeManager.OverrideOptions = ThemeManagerOverrideOptions.SystemTrayColors;
            ThemeManager.SetCustomTheme(this.Resources.MergedDictionaries[0], Theme.Light);

An exception of type 'System.InvalidOperationException' occurred in Unknown Module. and wasn't handled before a managed/native boundary
An exception of type 'System.InvalidOperationException' occurred in System.Core.ni.dll and wasn't handled before a managed/native boundary
An exception of type 'System.InvalidOperationException' occurred in System.Core.ni.dll and wasn't handled before a managed/native boundary
An exception of type 'System.InvalidOperationException' occurred in Unknown Module. and wasn't handled before a managed/native boundary
An exception of type 'System.InvalidOperationException' occurred in System.Core.ni.dll and wasn't handled before a managed/native boundary
An exception of type 'System.InvalidOperationException' occurred in System.Core.ni.dll and wasn't handled before a managed/native boundary
An exception of type 'System.InvalidOperationException' occurred in System.Core.ni.dll and wasn't handled before a managed/native boundary
An exception of type 'System.InvalidOperationException' occurred in System.Core.ni.dll and wasn't handled before a managed/native boundary

I'm not sure what's happening there and actually everything seems to be working just fine, still those exceptions doesn't look "that good"...?

[zzpbuaa]

How do you resolved it?