I am using jQuery selector to select my radio button by name and value, and i am using the code that i found on jquery: select input with given name and value
But it give me an error, my name and value are match with the code:

I am using jQuery selector to select my radio button by name and value, and i am using the code that i found on jquery: select input with given name and value
But it give me an error, my name and value are match with the code:

$("input[name='q_2'][value='Rerum.....']")values within quotes..