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@friz The problem on the worksheet you completed is on Line 16. 

The worksheet states -

Line 16 - Is the amount on line 10 of this worksheet more than the amount on line 15? 

Yes. Enter the amount from line 15.

Line 15 is 0 so Line 16 is 0

This is your child tax credit and credit for other dependents.

Enter this amount on Form 1040, line 19