How to solve DOM Error in IE 9 ?

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VB

Hi Yesterday my application works fine,but to i got error like this "Error: DOM Exception: NOT_FOUND_ERR (8)"
i dont know why this error appear.today just i add a little bit code and that code is

Dim su As String  = "<P> some text </P>"
            su += " <P><br/> dgdfgdfg </P>"
            su += " <P><br/>sdsdfsdfsfs </P>"
            su += "<P><br/>sfdsfsdfsdfsdf </P>"

for mailing concept i add this code for next line,but i remove this code it show same error,but other browser it works only ie browser it appear.

Even though i get error when i use ie for searching something,if i open new tab it show same error . what proble is it proble in ie only ?

pls reply asap

Regards
Aravind