Assuming the team serves you Isolating yourself from the team Employing hokey motivation techniques Not providing technical direction and context Fulfilling your own needs via the team Focusing on your individual contribution Trying to be technically omniscient Failing to delegate effectively Being ignorant of your own shortcomings Failing to represent the best interests of your team Failing to anticipate Repeat mistakes others have already made Using the project to pursue your own technical interests Not maintaining technical involvement Playing the game rather than focusing on the target Avoiding conflict Putting the project before the people Expecting everyone to think and act like you Failing to demonstrate compassion

Read the article for the details of mistakes. Great Mistakes in Technical Leadership – [Hacknot]