You can't open the application "App Store" because it is not supported on this type of Mac.
MacBook Pro, OS X Mavericks (10.9.1)
MacBook Pro, OS X Mavericks (10.9.1)
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OS X Mavericks is damaged in your MacBook. Hold Command and R keys while your Mac is starting up to start up into OS X Recovery, and reinstall Mavericks.
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Never mind, already answered.
You can't open the application "App Store" because it is not supported on this type of Mac.