Trying to enter my child's tuition expenses on the "Nonchartered, nonpublic school tuition credit question but I keep getting an error. Her tuition cosr is 11,300

There is no federal credit or deduction for K-12 education.  If you're working on a state return, you should identify the state, in the subject box.

If you're claiming a 529 distribution for K-12, you should so indicate. There is a $10,000 limit for that.

I am assuming you are in Ohio. You may be limited due to your income. On the program entry screen, for one child, do not enter more than $500.

 In the Ohio FAQ, Who qualified for the nonchartered, nonpublic school tuition credit? it states:

To qualify for this credit, you must pay tuition for your dependent(s) to an approved nonchartered, nonpublic school and your federal adjusted gross income (AGI) must be less than $100,000.

The credit equals the lesser of the total tuition paid for all dependents or:

• $500 if your  federal AGI is less than $50,000; OR
• $1,000 if your federal AGI is $50,000 to $99,999.

A list of approved nonchartered, nonpublic schools for each school year is available on the Ohio Department of Education's website.