Quartus II Internal error

Thanks for the reply MSchmitt.

Atlast I found the cause for the issue.

After adding the symbol to the .bdf file, I was trying to compile without generating pins by "Generate pins for symbol ports" option.

Once I generated the pins, the compilation completed successfully without showing any error.

It was my bad but it would have been better if the Quartus had shown any suitable compilation error instead of the verbose internal error.

Leaving this reply here as it would be helpful for someone who comeacross the same error.

Regards,

Renjith