Why using QVariantMap as a function parameter does not work in qml ?

[pluswave]

basically I want something in C++ like

@class myclass : QObject {
...
Q_INVOKABLE void myfunction( QVariantMap param);
}@

and call it in qml:

@myobject.myfunction({'a':'b'})@

However it doesn't work as I expected, there is no error reported, but I can't get myfunction called in C++ domain.

I am using Qt4.8.3 .

[pluswave]

ok that is my own fault. After recompile my project, issue is gone.