Because you can use it offline.
I told you i have a problem with online things.because i'm using dial up to connect to the internet and you know,I must pay for that and i must not make the phone line busy too.so i can't be online for a long time to read online documentaions.well i'm a student and i'm living with my family so i can't do such a thing.
Now could you help in a proper way?
**how to solve invalid keystore error in android studio here is error report----------------------->
here is error report--------> error:Error:java.lang.RuntimeException: com.android.ide.common.signing.KeytoolException: Failed to read key palash from store "D:\MyApplication3.idea\workspace.xml": Invalid keystore format ...