"Are you in the Subway?"

Translation: Ты в метро?

[tenhobi]

I have written "ты в метро?" and it says some typo is in "ты". What is wrong?

[Shady_arc]

Хммм... Are you sure you did not use one English letter somewhere?

[tenhobi]

I have used exactly "ты в метро?" (it's a copy from a clipboard). Maybe it does not like small letter? "ты" vs "Ты"? But I do not think so...