How do i correctly call Dbus function "org.freedesktop.Notifications.Notify" via dbus-c++ library on linux?

The dbus method specs are located here I am using the dbus-c++ library, there is virtually no real documentation for it apart from generated docs with no examples included.

after some extensive googling i could assembly the following code:

#include <iostream>
#include <vector>
#include <string> 
#include <dbus-c++-1/dbus-c++/dbus.h>

int main (int argc, const char **argv)
{
        DBus::BusDispatcher DbDispatcher;
        DBus::default_dispatcher = &DbDispatcher;
        DBus::Connection DbConnection = DBus::Connection::SessionBus();

        std::vector<std::string> actions = {"ACT_ONE", "Click me"};

        std::string appName = "TestApp";
        std::string body = "TestBody";
        std::string appIcon = "document-open";
        std::string summary = "Summary";

        DBus::CallMessage msg("", "", "org.freedesktop.Notifications", "Notify");
        DBus::MessageIter msgIter = msg.writer();

        msgIter.append_string(appName.c_str());
        msgIter.append_uint32(0);
        msgIter.append_string(appIcon.c_str());
        msgIter.append_string(summary.c_str());
        msgIter.append_string(body.c_str());

        DBus::MessageIter arrayIter = msgIter.new_array(DBUS_TYPE_STRING_AS_STRING);
        for(auto& iAction: actions)
        {
            arrayIter.append_string(iAction.c_str());
        }
        msgIter.close_container(arrayIter);

        DBus::MessageIter dictIter = msgIter.new_dict_entry();
        msgIter.close_container(dictIter);

        msgIter.append_int32(-1);

        DbConnection.send_blocking(msg);
};

but the above gives me:

dbus[12421]: arguments to dbus_message_new_method_call() were incorrect, assertion "destination == NULL || _dbus_check_is_valid_bus_name (destination)" failed in file ../../../dbus/dbus-message.c line 1365. This is normally a bug in some application using the D-Bus library.

with no backtrace. So apparently some arguments were appended the wrong way.

I'd just like a solution for this specific library, i don't like the alternatives.

Thanks in advance.