When I click on Growth Charts, the system displays the error U0011. What does it mean? This error is caused by incomplete information about your child such as incomplete Date of Birth or Gender. Please contact HealthHub at firstname.lastname@example.org and send us your feedback. Related articles If my child is not meeting the milestone. What should I do? I received a push notification from HealthHub informing that my child has upcoming vaccinations. What should I do? I cannot enter my child's birth information, developmental milestones and growth chart on HealthHub web portal. Why? I received a push notification from HealthHub informing that my child has missed vaccinations. What should I do? I would like my child to be seen by my own Paediatrician. Can I cancel my General Clinic appointment?