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If he made more than 4,300 and is not a full time student you can not claim him anymore.  Take him completely off your return.  Go to My Info and delete him.  Or when did he turn 19?  

 

Rules to claim a dependent
https://turbotax.intuit.com/tax-tips/family/rules-for-claiming-a-dependent-on-your-tax-return/L8LODb...