Hi Balasubramanian,
I think you need to give a full hdl path of your block and separate it with configure() and add_hdl_path(). These two functions all add hdl path to the reg block.
add_hdl_path() can append hdl_path at the current path, while configure should be called in different files like top level env files.
Hope this can help you.
Regards,
Euphemia