android - How to resolve access to class not allowed -

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i calling class jar file.
but, class called, application crashes , in logcat i'm getting error:

caused by: java.lang.illegalaccessexception: access class not allowed  @ java.lang.class.newinstanceimpl(native method)  @ java.lang.class.newinstance(class.java:1319)  @ android.app.instrumentation.newactivity(instrumentation.java:1053)  @ android.app.activitythread.performlaunchactivity(activitythread.java:2099)

what reason?
can please me?


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