JavaScript Error in report

When ever report is blank it gives me javascript error. In IE on bottom left it shows js error icon. Details of error are:

Line: 20
Char: 634
error: Object Required
Code: 0
URL:http://<servername>/Reports/Reserve...Map=true&EnableFindNext=False&LinkTarget=_top

If there is any data in report then it does not give any error.
For possible solutions I have checked that in IIS mapping for axd extension is already given and checkbox for check the file exists is unchecked.

If any one is having any idea then please help me ASAP.

Thanks in advance.....