Invalid Period token aToken on aDate : month numbers must be in the range 001-012
The current duration token refers to an absolute month period (ie. month number X of year Y) outside of the 1-12 range. This is equivalent to asking for the 8th day of the week, and makes no sense. Make sure you have not made a typo, or wanted to use relative month periods instead, such as [Fe:m+24] which is allowed.