If you want to apply conditional validation on 'Number Ascii Code' or 'Alphabet Ascii Code', then you need to add 'Language' input as 'Java'
{{userForm.controls?.language?.errors?.ascii.message}}
If you want to apply conditional validation on 'Alphabet Ascii Code' then you need to add 'Language' input as 'Java'.
Conditional Expression with type 'string'
{{userForm.controls?.alphabetAsciiCode?.errors?.ascii.message}}