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It is possible a line previous to OR after the line number 64 have a problem. I would say, go through it once to make sure the syntax are all correct and if you don't find anything, replace the current csf.conf with a new one and apply your changes.
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There is no issue for line 64 as per the data provided. I remember similar instance once where I could find an error in one of the lines between 1st and 64th. Check each line and take a thorough look to all lines you modified. If you cannot fix it, replace it with a fresh csf.conf as madaboutlinux suggested.