a question

I don't know the exact syntax error which causes this message but there is some kind of error in your syntax. Here are some examples of things you should check in your formula:

(3+4)(5+6)
might need to be
(3+4)*(5+6)
on some calculators or

((((4+5)*(4-5))/456)-6)+7)
notice that the last ) has no matching ( aka it's an extra.

Try to look for things like these. Hope this helps.