vera alternate UI

I have two controllers on my account. Through remote vera alternate UI I could get one controller. The second one gives an error ‘No Handler’. Any help please ?

I need more information : what kind of VERA for each controller ? which one is the main one which one is the secondary one. is ALTUI installed on both ?

Oh ! Oh ! i am sorry. I did not think like that. Under UI7 it appears under one account as if both are sharing programs. I could resolve it with your hint. I have installed on both Vera units and looks OK now. I, however, suceeded on third attempt as it keeps failing to install. Thank you for your prompt response and your time.