If numeric it can be up to 18 digits in length, but it must not contain more than one sign character or more than one decimal point.
A nonnumeric literal can consist of any allowable character in the computer's character set up to a maximum of 160 characters in the Procedure Division, or 2048 characters in the Data Division. A nonnumeric literal must be enclosed in quotation marks.
If you have used a figurative constant as the literal make sure that it is referenced by an allowable reserved word (such as ZERO) which you have spelled correctly. A figurative constant and a numeric literal must not be enclosed in quotation marks.
You might also have used the wrong class of literal for the context of the sentence.
Alternatively, if you have used the figurative constant ALL in your code, you have not coded it in accordance with the rules governing the use of this constant. ALL must be followed by a nonnumeric literal and not by a numeric one.