Activity Monitor Keeps Crashing

Hi,

Recently, I've uninstalled Xcode, and now Activity Monitor keeps crashing

The Activity Monitor Crash Log says:

Command: Activity Monitor

Path: /Applications/Utilities/Activity Monitor.app/Contents/MacOS/Activity Monitor

Parent: WindowServer [61]

Version: 1.5 (54)

PID: 181

Thread: Unknown

Link (dyld) error:

Library not loaded: /System/Library/PrivateFrameworks/GraphKit.framework/Versions/A/GraphKit

Referenced from: /Applications/Utilities/Activity Monitor.app/Contents/MacOS/Activity Monitor

Reason: image not found

How can I resolve this problem? Do I need to restore the GraphKit Library? If yes, where can I get it?