What reason for no e-file does it give?
Do you have no taxable income or a W-2 with nothing in box 1?
I need to fix my run number
What is that? What is the exact message?
@frankbrown886688 Who is the custodial parent? Is your wife (or is she an EX-wife?) the custodial parent? Or do the children live with you? As far as the IRS is concerned, the custodial parent is the one the children spent the most nights with during the year--at least 183 nights.
If the kids were claimed by someone who should not have claimed them (and an unrelated person cannot claim them unless they lived there the WHOLE year) then file your own return that claims the children and mail your tax return. The IRS will sort it out.