Believe it or not, you didn't put a space before the constant in the 3rd and 4th elements of F. Notice that they both end in blahblah -3.1415926
MATLAB is interpreting that space before the minus sign (and lack of space after it) as two elements on that row -- ie equivalent to blahblah,-3.1415926. Take out the space before the minus sign or add one after it (before the constant).
BTW, rather than letting fsolve find the error, do a quick check by calling moments directly from the Command Window: moments([1;2;3;4;5])
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