crash - Android exception while adding calendar -

i'm facing strange problem when i'm trying add calendar contentprovider,

it works there 1 device i'm testing on , doesn't - got crash. device: tablet android 4.0.4 (api15).

some of code:

    private static uri buildcaluri() {     return calendarcontract.calendars.content_uri.buildupon()             .appendqueryparameter(calendarcontract.caller_is_syncadapter, "true")             .appendqueryparameter(calendars.account_name, account_name)             .appendqueryparameter(calendars.account_type, account_type).build(); }  private static contentvalues buildcontentvalues(calendardata cd) {      string dispname = cd.getname();     string intname = int_name_prefix + dispname;     final contentvalues cv = new contentvalues();     cv.put(calendars.account_name, account_name);     cv.put(calendars.account_type, account_type);     cv.put(calendars.name, intname);     cv.put(calendars.calendar_display_name, dispname);     cv.put(calendars.calendar_access_level, calendars.cal_access_none );     cv.put(calendars.owner_account, account_name);     cv.put(calendars.visible, cd.isvisible() ? 1 : 0 );     cv.put(calendars.sync_events, 1 );     return cv; }  public static long addcalendar(context context, final calendardata cd,         final contentresolver cr) {     if (cd == null)         throw new illegalargumentexception();      /*      * on android < 4.1 create account our calendars. using account_type_local      * cause these bugs:      *       * - on android < 4.1: selecting "calendars sync" in calendar app crashes      * nullpointerexception. see http://code.google.com/p/android/issues/detail?id=27474      *       * - on android <= 2.3: opening calendar app ask create account first      * when local calendars present      */      long calid;     // add calendar     final contentvalues cv = buildcontentvalues(cd);     uri uri = cr.insert( buildcaluri(), cv );      calid = long.parselong( uri.getlastpathsegment() );      return calid;  } 

and got:

e/androidruntime( 3221): fatal exception: asynctask #3 e/androidruntime( 3221): java.lang.runtimeexception: error occured while executing doinbackground() e/androidruntime( 3221): @ android.os.asynctask$3.done(asynctask.java:278) e/androidruntime( 3221): @ java.util.concurrent.futuretask$sync.innersetexception(futuretask.java:273) e/androidruntime( 3221): @ java.util.concurrent.futuretask.setexception(futuretask.java:124) e/androidruntime( 3221): @ java.util.concurrent.futuretask$sync.innerrun(futuretask.java:307) e/androidruntime( 3221): @ java.util.concurrent.futuretask.run(futuretask.java:137) e/androidruntime( 3221): @ java.util.concurrent.threadpoolexecutor.runworker(threadpoolexecutor.java:1076) e/androidruntime( 3221): @ java.util.concurrent.threadpoolexecutor$worker.run(threadpoolexecutor.java:569) e/androidruntime( 3221): @ java.lang.thread.run(thread.java:856) e/androidruntime( 3221): caused by: java.lang.nullpointerexception e/androidruntime( 3221): @ android.os.parcel.readexception(parcel.java:1333) e/androidruntime( 3221): @ android.database.databaseutils.readexceptionfromparcel(databaseutils.java:182) e/androidruntime( 3221): @ android.database.databaseutils.readexceptionfromparcel(databaseutils.java:136) e/androidruntime( 3221): @ android.content.contentproviderproxy.insert(contentprovidernative.java:415) e/androidruntime( 3221): @ android.content.contentresolver.insert(contentresolver.java:733) e/androidruntime( 3221): @ com.my.app.calendarmapper.addcalendar(calendarmapper.java:128) 

line 128 calendarmapper is: uri uri = cr.insert( buildcaluri(), cv );

and don't know can cause exeption.. ideas ?

thanks in advance!

you need use asyctask this. please show code.