global-linum-mode is undefined in emacs?

global-linum-mode is undefined in emacs?

I'm trying to display all line numbers using (global-linum-mode t), but an
error occurred saying the function is not defined, but it seems other
people are good with it. So how should I fix this problem?
Code: (setq transient-mark-mode t) (global-linum-mode t)
Error:
File Edit Options Buffers Tools Help
("emacs" "/Users/chenhelihua/.emacs")
Loading encoded-kb...done
An error has occurred while loading `/Users/chenhelihua/.emacs':
Symbol's function definition is void: global-linum-mode
To ensure normal operation, you should investigate and remove the
cause of the error in your initialization file. Start Emacs with
the `--debug-init' option to view a complete error backtrace.