Reinstall of mail.app using Pacifist isn't working

I have Mac G4 --- v:10.3.9
I somehow erased Mail.app last year when it was acting strange, thinking I could reload it.
I decided to reload it again recently, so I used Pacifist to open the Jaguar disk (disk 1 install), opened the "essentials package" to find the mail application. Once I found it, I then extracted it to it's original location. Mail.app is now sitting in Applications. There is no arrow-no file. Just the icon.
When I click on it, it will not boot-did I forget something? Ha-

Thanks for any input...
Allison
P.S. here is my mail crash report:

OS Version: 10.3.9 (Build 7W98)
Report Version: 2

Command: Mail
Path: /Applications/Mail.app/Contents/MacOS/Mail
Version: ??? (???)
PID: 512
Thread: Unknown

Link (dyld) error:

dyld: /Applications/Mail.app/Contents/MacOS/Mail can't open library: /System/Library/PrivateFrameworks/Mail.framework/Versions/B/Mail (No such file or directory, errno = 2)