I am using Arcgis 10.6. I keep running into a 050035 error when running the create TIN tool. I am working with point masses. And my dataset does not have z values and the tag field also specifies <none>.
Check the source feature classes and make sure they aren't empty. If the spatial references for the features and the TIN are different, they should at least overlap in extent. Additionally, at least some data being added to the TIN, now or previously, must have z-values. They can't all be 2D.
