The stack trace in the console output you posted is trying to point you to the issue.
Quote:
[cRIO] at edu.wpi.first.wpilibj.templates.DataLogger.<init>( DataLogger.java:25)
[cRIO] at edu.wpi.first.wpilibj.templates.AerialAssist.robot Init(AerialAssist.java:84)
[cRIO] at edu.wpi.first.wpilibj.IterativeRobot.startCompetit ion(IterativeRobot.java:72)
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We'll probably need to see the call to DataLogger from line 84 of your code (and any surrounding code that may define or set variables passed into that call) and the code from DataLogger.java (specifically line 25 and the rest of the method that line 25 is in)