Debuging help

[#1]

Some one please help debugging this. am not sure what am doing wrong

If(Num(Month(POL_CRT_DATE) = 1, 'January',

If(Num(Month(POL_CRT_DATE) = 2), 'February',

If(Num(Month(ATA_POSTING_DATE )= 3), 'March',

If(Num(Month(POL_CRT_DATE) = 4), 'April',

If(Num(Month(ATA_POSTING_DATE = 5), 'May',

If(Num(Month(POL_CRT_DATE) = 6), 'June',

If(Num(Month(ATA_POSTING_DATE) = 7, 'July',

If(Num(Month(POL_CRT_DATE) = 8), 'August',

If(Num(Month(ATA_POSTING_DATE) = 9, 'September',

If(Num(Month(POL_CRT_DATE) = 10, 'October',

If(Num(Month(ATA_POSTING_DATE) = 11, 'November',

If(Num(Month(POL_CRT_DATE) = 12, 'December')))))))))))) AS Months,