After a week, there is some progess,
I was able to provide user alternative by just changing the language in their browser , from japanese to english.
But this doesn't solve our problem. I am unable to find the exact cause behind error.
I need to find a solution without changing the language from JP to EN in users browser.
Siddharth, Thank you for your reply.
I have checked the role assignment. It is common to all and yes, it is also proper to users with error.
I am not sure abt what path you are suggesting. I took a http trace.
only pcd path shown was the theme path in http trace. All I could see is the js, css, html files being loaded. I am not able to find anything from that.Could you please elaborate.