У меня это выглядит так:
```
java -cp out ru.fizteh.fivt.students.vishnevskiy.shell.Shell pwd
Exception in thread "main" java.lang.NullPointerException
	at ru.fizteh.fivt.students.vishnevskiy.shell.CommandsOperator.loadClasses(CommandsOperator.java:16)
	at ru.fizteh.fivt.students.vishnevskiy.shell.CommandsOperator.<init>(CommandsOperator.java:37)
	at ru.fizteh.fivt.students.vishnevskiy.shell.Shell.main(Shell.java:42)
```