Activity Monitor not working in Yosimite

Error Message:  You can’t use this version of the application “Activity Monitor.app” with this version of OS X.
I am now running Yosimite. Activity Monitor picture not displayed on its icon either.
How do I get Activity Monitor to run and get the icon picture to display too.
ggdad

Heheh revjay, exactly :-D
@ Leinie: When you install any new software or updates, then it's always a good idea to repair permissions, so you will have a "clean" system afterwards.
Repairing permission also solves quite a lot of issuses with applications i.e. if they tend to hang, or crash. So this should always be one of the first things you do when something is not doing as it should on your mac.
Glad that it works now

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