Apply Object Style for Anchor

Hi All,

Could anyone please give solution for my request.

1. Find Anchor marker

2. Apply object style for that selecting parent Graphics frame.

var myDoc = app.activeDocument;

app.findGrepPreferences = app.changeGrepPreferences = null;

app.findGrepPreferences.appliedParagraphStyle = "abc"

app.findGrepPreferences.findWhat = "~a"

var myFound = myDoc.findGrep();

for(i=0; i<myFound.length; i++)

{

    myFound.parentTextFrames[0].appliedObjectStyle = app.activeDocument.objectStyles.item("Image")   //Error this only

    }

Thanks in advance

Beginner