How to highlight variables in Eclipse (Mark occurrences)

How to highlight variables in Eclipse (Mark occurrences)

Window > Preferences > mark.

Only enable the option "Mark ocurrences of...."

Solution: Launch shortcut 'org.python.pydev.debug.ui.launchShortcut.python.unittest'

Error trying to Run a Project or a Class

Launch shortcut 'org.python.pydev.debug.ui.launchShortcut.python.unittest' enablement expression caused exception. Shortcut was removed.

stacktrace:
org.eclipse.core.runtime.CoreException: No property tester contributes a property org.python.pydev.debug.ui.python_type to type class org.eclipse.ui.part.FileEditorInput
    at org.eclipse.core.internal.expressions.TypeExtensionManager.getProperty(TypeExtensionManager.java:123)

Solution:

In this folder: C:\Workspace\.metadata\.plugins\org.eclipse.cdt.ui

1. Check the level of Security and Access in the folder/files
2. Create a file named: global-build.log