Microsoft JScript runtime error: Object expected while call javascript

When call a javascript function on button click its displaying error like this.

button:

<asp:Button runat="server" Text="Click" OnClientClick="FindInnerGridValue()" />

Error: Microsoft JScript ru开发者_高级运维ntime error: Object expected.

Note: Last day it was working fine. But today it does not. I didn't changed any thing but added one more function.