Remember that everyone has strengths and weaknesses. No one is infallible. Your willingness to consider suggested improvements implies that you are a dedicated employee worth keeping. Listen thoughtfully. If the information you receive is a complete surprise to you, tell your manager that you would like some time to digest everything and request a time to meet again. Do a self-appraisal to think of reasons why your manager might perceive the identified weaknesses. Go to the second meeting prepared to calmly ask questions.

What does infallible mean in this paragraph

Infallible means incapable of making mistakes or being wrong.