I am trying to use  JS getDataPage method  using the onload event, but I'm facing the following error : 

"Cannot read properties of undefined (reading 'ui')"

I tried to use the same approch sugested by another question: 

"https://support.pega.com/question/error-getdatapage-method-js-api"

but its not working.

this is the script I'm using inside a section: 

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<script event="onload">  
<%
ClipboardPage UIActionPage = ((PegaAPI) tools).getUIEngine().getUIActionPage("runActivity");
ClipboardPage actionAPI = UIActionPage.getPage("pyActionAPI");

actionAPI.putString("pyActivity", "pzGetDataPageJSON");
ClipboardPage activityParam = actionAPI.getProperty("pyActivityParams").getPageValue(ClipboardProperty.LIST_APPEND);

activityParam.putString("pyName", "pyDataPageName");
activityParam.putString("pyValue", "D_Criptografar");
((PegaAPI) tools).getUIEngine().getUIAction(UIActionPage).register();
  
UIActionPage.removeFromClipboard();  
%>

 var options = {
                name: "D_Criptografar",
                parameters: [{name: "numeroEstudo", value: "numeroEstudo", isProperty: false},
                             {name: "cdCgccpf", value: "cd_cgccpf", isProperty: false},
                             {name: "cdSite", value: "site", isProperty: false},
                             {name: "ctrl", value: "ctrl", isProperty: false}],
                callback: callbackA,                
            };
 
  
  pega.api.ui.actions.getDataPage(options); 
  
function   callbackA(RESULT) {
  
 console.log(RESULT);
} 
</script>

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Could somebody help me ? am I doing something wrong?