jqGridImport & jqGridExport working synergy

[HASTJI]

Hello. is there any valid method to save current colums visability for current user in JqGrid? I mean when it was version 4.6 - I made it with :
$("#gridframe").jqGrid('jqGridImport',{imptype:"jsonstring", impstring:window.localStorage.getItem("%userid%-gridframe")});
in the beggining, before JqGrid is builded and then created button, which saves all prefs of current grid in local storage:
window.localStorage.setItem("%userid%-gridframe",$("#gridframe").jqGrid('jqGridExport',{exptype:'jsonstring'}));
But with the latest version it said that jqGridImport is not a function and when I changed it to:
$.jgrid.jqGridImport( "gridframe", {imptype:"jsonstring", impstring : window.localStorage.getItem("%userid%-gridframe")});
It started saying that json array is not valid, but all was okay when it was old version.

What I'm doing wrong? I already tried to figure out about new syntax, but didn't get any correct results in my researches....