Align Inline Equation to Baseline

Hi,

   I found this code to align line objects to baseline from this forum.  But its throwing error (null object).

var fp = app.selection[0].graphics[0].itemLink.filePath;

var f = File(fp);

f.open('r');

var fs = f.read();

f.close();

var baseline = fs.match(/%%Baseline\s+(\S+)/)[1];

app.selection[0].anchoredObjectSettings.anchorYoffset = -Number(baseline);

Can anyone guide me...

Thanks in advance,

Sudha K