Flow Error: The number of results does not match ....

Here is the apex class I am using, I want to store list<string> data from a json file into a flow variable:

global class par{
    global static List<string> l = new list<string>();
@InvocableMethod(label='Get Map' description='Returns the values of Maps')
    global static List<String> CallMap(){
        HttpRequest req = new HttpRequest();
        req.setEndpoint('https://maps.googleapis.com/maps/api/geocode/json?address=1600+Amphitheatre+Parkway,+Mountain+View,+CA&key=AIzaSyBOyIQi54LMykmzSOvCuQ2naVvVQEsEfHw');
        req.setMethod('GET');
        Http http = new Http();
        HTTPResponse res = http.send(req);
        JSONParser parser = JSON.createParser(res.getBody());
        while (parser.nextToken()!= null)
        {
            if ((parser.getCurrentToken() == JSONToken.FIELD_NAME))
            {
                    string fieldName = parser.getText();
                    parser.nextToken();
                if(fieldName == 'place_id')
                {
                    string place = parser.getText();
                    system.debug(place);
                    l.add(place);
                	parser.nextToken();
                }else if(fieldName == 'status')
                	{
                    string status = parser.getText();
                    system.debug(status);
                    l.add(status);
                    }
        	}
    	}
        return l;
    }
}