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Maven Error: Could not calculate build plan

Whenever this error popped out:

Could not calculate build plan: Plugin org.apache.maven.plugins:maven-resources-plugin:2.6 or one of its dependencies could not be resolved: Failed to read artifact descriptor for org.apache.maven.plugins:maven-resources-plugin:jar:2.6

Just go to Eclipse » Preferences » Maven » User Settings
And point the value to
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