How to find text with appliedCharacterStyle inside CharacterStyleGroup?

[Karthik SG]

var doc = app.activeDocument;
var doc_allParaStyles = doc.allParagraphStyles;
for(var p = 0 ; p < doc_allParaStyles.length ; p++){ 
    var AllNestedStyles = doc_allParaStyles[p].nestedStyles;
     for(var n=0; n<AllNestedStyles.length;n++){
            var NestedStyleName=AllNestedStyles[n].appliedCharacterStyle.name;
            app.findTextPreferences = NothingEnum.nothing;
            app.findTextPreferences.appliedCharacterStyle = NestedStyleName;
      //here how to find text with aplliedCharacterStyle inside characterStyleGroups!
            var found_txt = app.activeDocument.findText();
            app.findTextPreferences = NothingEnum.nothing;
            for(var a =0 ; a < found_txt.length ; a++)
             {
                var foundCon = found_txt[a].contents;
            } 
        }
    }

In the above code, when I try to find any characterStyleName inside the characterStyleGroup, it is shows following error:

Error: Invalid value for set property 'appliedCharacterStyle'. Expected String, CharacterStyle or NothingEnum enumerator, but received "c4H".

Is there anyother way to find with allCharacterStyles (including groups)! 

[Karthik SG · Accepted solution]

found the way! its working now..

var doc = app.activeDocument;
var doc_allParaStyles = doc.allParagraphStyles;
for(var p = 0 ; p < doc_allParaStyles.length ; p++){ 
    var AllNestedStyles = doc_allParaStyles[p].nestedStyles;
     for(var n=0; n<AllNestedStyles.length;n++){
        if(AllNestedStyles[n].appliedCharacterStyle.parent == "[object CharacterStyleGroup]"){
            var charStyleGroupName = AllNestedStyles[n].appliedCharacterStyle.parent;
            var NestedStyleName=AllNestedStyles[n].appliedCharacterStyle.name;
            cstylegroup = app.activeDocument.characterStyleGroups.itemByName(charStyleGroupName.name);
            app.findTextPreferences = NothingEnum.nothing;
            app.findTextPreferences.appliedCharacterStyle = cstylegroup.characterStyles.itemByName(NestedStyleName);
            var found_txt = app.activeDocument.findText();
            app.findTextPreferences = NothingEnum.nothing;
            for(var a =0 ; a < found_txt.length ; a++)
             {
                var foundCon = found_txt[a].contents;
            }
        }
        else{
            var NestedStyleName=AllNestedStyles[n].appliedCharacterStyle.name;
            app.findTextPreferences = NothingEnum.nothing;
            app.findTextPreferences.appliedCharacterStyle = NestedStyleName;
            var found_txt = app.activeDocument.findText();
            app.findTextPreferences = NothingEnum.nothing;
            for(var a =0 ; a < found_txt.length ; a++)
             {
                var foundCon = found_txt[a].contents;
            } 
        }
        }
    }