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fatal exemption: main problem when clicking 7 day button

I'm constantly getting Fatal Exception: main

java.lang.NullPointerException: id == null at java.util.TimeZone.getTimeZone at com.example.Day.getDayOfTheWeek(Day.java:66) at com.....DayAdapter.getView(DayAdapter.java:64)

I've compared the codes for DayAdapter and Day. They are all identical. I don't know where to look for to debug