I'm trying to get a totalvolume of an old tick by using getToalAskVolume().
My code is something like shown below:

List<ITick> myticks =
          history.getTicks(Instrument.EURUSD, (tmptime-1*60*60*1000),tmptime);
double mytotal; 
mytotal = myticks.get(100).getTotalAskVolume();

This code can be compliled. But when I run it, it emits NullPointerException.
What is wrong? Any advise would be appreciated.

Apparently there are less than 100 ticks in the list. You can check the list size by myticks.size().

Thank you quick response.
myticks.size() shows more than 2000. Even if it is set as
mytotal = myticks.get(0).getTotalAskVolume(); , it emits NullPointerException.

The issue has been registered. Please use ITick.getAskVolume().

NullPointerException problem is fixed for a historical data in build 2.6.66.

ITick.getTotalAskVolume() supports live ticks only.
Historical Ticks data / cached ticks data has no any information about top bid/ask prices/volumes.
For historical ticks, this information is based on the getAsk() / getBid() / getAskVolume() / getBidVolume() prices/volumes.