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Continuing with its look at the “deadly sins” committed by business professionals, BlackEnterprise.com takes a look at a manager’s gravest offenses.

Erika Zeigler, senior producer at Music Choice, provides the insight. She started as an intern with the company and, after eight years, has worked her way up the ranks. Among her advice, “Thou shall not have your power cake and eat it too,” cautioning against being friends with those that you’ll now have to manage. “In the office, be sure to reiterate to friends that you won’t be mixing business with personal,” the article says.

Also, don’t be a know-it-all.

“Just because you’ve been at a company a long time doesn’t mean you know everything about being a manager,” Zeigler reminds us.

For more managerial advice, click over to BlackEnterprise.com.