Hi Micahelmayer,
Thank you for your reply.
I deleted the "rstudio" folders from users home directory like..
/home/trin/.local/share/rstudio
/home/trin/.config/rstudio
Along with "rstudio" folder, I also deleted, a folder named "R" from user's home directory "/home/trin".
This worked for me. But, this issue is happening again and again with same user.
Please let me know that Is there any permanent fix for this problem.
Thank you once again.