Marketing cloud SSJS DE Query Preview fails - salesforce-marketing-cloud

Question

I am trying to query a simple DE using ssjs. There is nothing extra ordinary in this one as this is fairly simple.
somehow the preview is failing
<script runat="server">
Platform.Load('core', '1.1.1');
var postData = Platform.Request.GetPostData();
var form = Platform.Function.ParseJSON(postData);
var Operator_Value = form['Operator_Value'];
var Operation_Value = form['Operation_Value'];
var User_Value = form['User_Value'];
var DE = form['Dataextension'];
try{
var myDE = DataExtension.Init(DE);
var filter = {
Property:Operator_Value,SimpleOperator:Operation_Value,Value:User_Value};
var data = myDE.Rows.Retrieve(filter);
Write(Stringify(data));
}
catch(error){
Write("<br>error: " + Stringify(error));
}
</script>
The response i get when i preview is
error: {"message":"Object expected: Retrieve","jintException":"Jint.Native.JsException: Exception of type 'Jint.Native.JsException' was thrown.\r\n at Jint.ExecutionVisitor.Visit(MethodCall methodCall)\r\n at Jint.Expressions.MethodCall.Accept(IJintVisitor visitor)\r\n at Jint.ExecutionVisitor.Visit(MemberExpression expression)\r\n at Jint.Expressions.MemberExpression.Accept(IJintVisitor visitor)\r\n at Jint.ExecutionVisitor.Visit(VariableDeclarationStatement statement)\r\n at Jint.Expressions.VariableDeclarationStatement.Accept(IJintVisitor visitor)\r\n at Jint.ExecutionVisitor.Visit(BlockStatement statement)\r\n at Jint.Expressions.BlockStatement.Accept(IJintVisitor visitor)\r\n at Jint.ExecutionVisitor.Visit(TryStatement statement)","description":"Jint.Native.JsException: Object expected: Retrieve\r\nException of type 'Jint.Native.JsException' was thrown. - from Jint\r\n\r\n"}
not sure what i am doing wrong . This DE is present in Enterprise Shared BU and i am running this script in Enterprise BU .
I am using customer key of DE. Even if i hardcode all parameter which i get from form, still same error
<script runat="server">
Platform.Load('core', '1.1.1');
var postData = Platform.Request.GetPostData();
var form = Platform.Function.ParseJSON(postData);
var Operator_Value = form['Operator_Value'];
var Operation_Value = form['Operation_Value'];
var User_Value = form['User_Value'];
var DE = form['Dataextension'];
try{
var myDE = DataExtension.Init('Ext_Customer');
var filter = {
Property:'ContactId',SimpleOperator:'equals',Value:'003ABCD1003'};
var data = myDE.Rows.Retrieve(filter);
Write(Stringify(data));
}
catch(error){
Write("<br>error: " + Stringify(error));
}
</script>

Answer 1

I still do get the error , but i read on some blogs to publish even when preview fails
that approach seems to be working.