Hi! It must be so called “Activation code”: few uppercased alpha-numeric groups, delimited by dashes

I have one which matches that description, but that throws an exception which aludes to a string to int cast error! Stack trace:

java.lang.NumberFormatException: For input string: “”
at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
at java.lang.Integer.parseInt(Integer.java:592)
at java.lang.Integer.parseInt(Integer.java:615)
at com.pd4ml.util.GOST$Auth.<init>(GOST.java:41)
at com.pd4ml.PD4ML.applyLicense(PD4ML.java:271)

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