saveDiagram api throws error

[Sourangsu Dasgupta]

I am facing some issue while trying to save a diagram . Please take a look at this code :

function loadDiagramInMemory(currentForm) {

    var diagram = currentForm.data('diagram');

    var saveData = diagram.saveDiagram();

    localStorage.setItem('file', saveData);

}

which results into this exception :

I am not sure , what I am doing wrong here. just for reference this call is happening after getting success data from controller 

 .syncPost({

        action: "CreateTask",

        actionArgs: postdata,

        resultTarget: function (result) {

            var canvasData = JSON.parse(result);

            loadDiagramInMemory();

            RefreshCanvas();

        }

    });

[Balasubramanian Manikandan]

We analyzed your query and rendered a sample for your scenario, and it is working fine at our end. We attached a sample for your reference, still if you face any issues kindly share us more details such us modify the below sample or share us any simple sample illustrating issue. This would help us to analyze further and provide solution.

Sample

https://stackblitz.com/edit/nbdixb-423xeh?file=index.html,index.js