Use of the Earlier function

Hi Everyone
I am trying to use the Earlier function to get the value of the previous row for the function referenced. I keep getting the below error for its use in the second half of the If statement. I am using Earlier with a function and not a column so I am not sure
if that is the issue or something else. I tried it using a '2' instead of a '1', but that didn't help.
Does anyone know anything about this?
Function:
=if(earlier([Numerator-new],1)<>0,earlier([Numerator-new],1),0)
Error:
"Calculation error in measure 's1Perm1'[Calculated field 1]: EARLIER/EARLIEST refers to an earlier row context which doesn't exist."

This is somewhat complicated, but this logic would work:
a. If the ExitMonth > 6 then get the record where the ExitMonth is 3 months less than the current record (if it exists) and where the JudgeName, JudgeTitle and Year fields are the same as the current record.
b. If the ExitMonth > 1 and ExitMonth < 6 then get the record where the ExitMonth is 1 month less than the current record (if it exists) and where the JudgeName, JudgeTitle and Year fields are the same as the current record.
c. If the ExitMonth =1 then get the record where the ExitMonth =.5 and where the JudgeName, JudgeTitle and Year fields are the same as the current record.
I am attaching a screenshot below (with info redacted) of a few records that represent what this looks like.

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