go back through all the questions for the dependent. make sure that the question did (dependent's first name) pay more than 1/2 their living expenses is answered "no"
don't know what version you're using but if other than the free version contact support if you can get the CTC to work
Contact Customer Service
5am-5pm Pacific Time (8-8 Eastern) Monday - Friday
https://support.turbotax.intuit.com/contact
the other thing you can try is to delete the worksheet for the dependent then go back and re-enter. carefully read each question. also visit the CTC section
