Android Studio Null pointer exception when rendering xml layouts -

yesterday making changes app, specificly actionbar colors, worked perfectly, able preview on android studio without problems , run on device works perfectly, morning when opened android studio, wont preview , throwing exception:

java.lang.nullpointerexception     @ android.graphics.bitmap_delegate.createbitmap(bitmap_delegate.java:599)     @ android.graphics.bitmap_delegate.createbitmap(bitmap_delegate.java:120)     @ android.graphics.bitmap_delegate.createbitmap(bitmap_delegate.java:102)     @ com.android.layoutlib.bridge.impl.resourcehelper.getdrawable(resourcehelper.java:236)     @ com.android.layoutlib.bridge.bars.actionbarlayout.getdrawable(actionbarlayout.java:222)     @ com.android.layoutlib.bridge.bars.actionbarlayout.setupactionbar(actionbarlayout.java:160)     @ com.android.layoutlib.bridge.bars.actionbarlayout.<init>(actionbarlayout.java:127)     @ com.android.layoutlib.bridge.impl.rendersessionimpl.createactionbar(rendersessionimpl.java:1627)     @ com.android.layoutlib.bridge.impl.rendersessionimpl.inflate(rendersessionimpl.java:355)     @ com.android.layoutlib.bridge.bridge.createsession(bridge.java:329)     @ com.android.ide.common.rendering.layoutlibrary.createsession(layoutlibrary.java:332)     @ com.android.tools.idea.rendering.renderservice$3.compute(renderservice.java:575)     @ com.android.tools.idea.rendering.renderservice$3.compute(renderservice.java:564)     @ com.intellij.openapi.application.impl.applicationimpl.runreadaction(applicationimpl.java:932)     @ com.android.tools.idea.rendering.renderservice.createrendersession(renderservice.java:564)     @ com.android.tools.idea.rendering.renderservice.render(renderservice.java:691)     @ org.jetbrains.android.uipreview.androidlayoutpreviewtoolwindowmanager.dorender(androidlayoutpreviewtoolwindowmanager.java:604)     @ org.jetbrains.android.uipreview.androidlayoutpreviewtoolwindowmanager.access$1900(androidlayoutpreviewtoolwindowmanager.java:80)     @ org.jetbrains.android.uipreview.androidlayoutpreviewtoolwindowmanager$7$1.run(androidlayoutpreviewtoolwindowmanager.java:546)     @ com.intellij.openapi.progress.impl.progressmanagerimpl$2.run(progressmanagerimpl.java:178)     @ com.intellij.openapi.progress.progressmanager.executeprocessunderprogress(progressmanager.java:209)     @ com.intellij.openapi.progress.impl.progressmanagerimpl.executeprocessunderprogress(progressmanagerimpl.java:212)     @ com.intellij.openapi.progress.impl.progressmanagerimpl.runprocess(progressmanagerimpl.java:171)     @ org.jetbrains.android.uipreview.androidlayoutpreviewtoolwindowmanager$7.run(androidlayoutpreviewtoolwindowmanager.java:541)     @ com.intellij.util.ui.update.mergingupdatequeue.execute(mergingupdatequeue.java:320)     @ com.intellij.util.ui.update.mergingupdatequeue.execute(mergingupdatequeue.java:310)     @ com.intellij.util.ui.update.mergingupdatequeue$2.run(mergingupdatequeue.java:254)     @ com.intellij.util.ui.update.mergingupdatequeue.flush(mergingupdatequeue.java:269)     @ com.intellij.util.ui.update.mergingupdatequeue.flush(mergingupdatequeue.java:227)     @ com.intellij.util.ui.update.mergingupdatequeue.run(mergingupdatequeue.java:217)     @ com.intellij.util.concurrency.queueprocessor.runsafely(queueprocessor.java:238)     @ com.intellij.util.alarm$request$1.run(alarm.java:327)     @ java.util.concurrent.executors$runnableadapter.call(executors.java:471)     @ java.util.concurrent.futuretask$sync.innerrun(futuretask.java:334)     @ java.util.concurrent.futuretask.run(futuretask.java:166)     @ java.util.concurrent.threadpoolexecutor.runworker(threadpoolexecutor.java:1110)     @ java.util.concurrent.threadpoolexecutor$worker.run(threadpoolexecutor.java:603)     @ java.lang.thread.run(thread.java:722) 

all activities empty causes problem

<relativelayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingleft="@dimen/activity_horizontal_margin" android:paddingright="@dimen/activity_horizontal_margin" android:paddingtop="@dimen/activity_vertical_margin" android:paddingbottom="@dimen/activity_vertical_margin" tools:context="com.andujardev.money.accountcreator"> </relativelayout> 

the exception thrown when rendering preview

any help?

ask if need more info

edit: reason, error has action bar, have layout doesnt show action bar , can render normally, cant find problem program can compile , run time want.

solved! seems app icon image used (which changed last night) not on correct format render library not render image properly, device able use correctly.