App store & Contacts won't open

This is very odd and appeared very suddenly. Running 10.10.3 for some time now with no problems.  However, in the last few days, I can not not open my Contacts or App store. As I said, it appeared very suddenly. I looked online and in the forum, but could not find answers. Any solutions and/or fixes would be greatly appreciated.

Try restarting your Mac in Safe mode:
- Shut down your Mac
- Wait until your computer turns off and after that press the Power button
- Right after you hear the startup tone, press and hold the Shift key
- Release the Shift key when you see a grey Apple sign and the progress bar below this sign
- Once you see Desktop, start a Disc Utility scan to detect and repair file system errors (don't forget to choose your main hard drive)
- Click on Verify Disc and then, if asked to fix problems, on Repair Disk
- After this, click on Verify Disc Permissions and then on Repair Disc Permissions
- After the process is finished, shut down your Mac and turn it back on after about 30 seconds

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