The Controls collection cannot be modified because the control contains code blocks (i.e. ... )

Hello,

            I am getting http exception in of the method of class file (search.aspx.vb) like "The Controls collection cannot be modified because the control contains code blocks (i.e. <% ... %>)", I have googled a lot including in this site and Mudassar Khan’s article in asp snippets.  I have tried placing Java script function in the body of Master page from header, whereas I just removed the Java script tag and its contents in search.aspx( as of its not required now). Still getting exception.  I also know that if we have something like this <%= in Java script function we need to replace with <%#.  But I don’t have this kind of code in any function.  Please help.