custom user setting problem / issue

<#if !user.anonymous>

profile.user.data = ${settings.name.get("profile.user.data")}

<@liaAddScript>
;(function($) {
	$.post("/restapi/vc/users/self/profiles/name/user.data/set", {value: "my user data Two"}).done(function(data) {
		console.log(data);
		alert("done");
	}).fail(function() {
		alert("error");
	});
})(LITHIUM.jQuery);
</@liaAddScript>

</#if>

This code prints out

profile.user.data = my user data ONE

and when I tried to set it to "my user data Two", I got "error code 100 - An unexpected error has occured" in the response. I was logged in as admin, and I was testing it inside studio component editor.

I have also tried all these:

$.post("/restapi/vc/users/self/profiles/name/user.data/set", ...

$.post("/restapi/vc/users/self/profiles/name/profile.user.data/set", ...

$.post("/restapi/vc/users/self/settings/name/user.data/set", ...

$.post("/restapi/vc/users/self/settings/name/profile.user.data/set", ...

Also no luck.

BTW, lithium team helped us set up this:

[profile]

user.data    :wcu   string  0   64000

Thanks.