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: 

-----------------------------------------------------------------------------------------------

<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>

---------------------------------------------------------------------------------------------

Could somebody help me ? am I doing something wrong?