Not able to use play and pause button or the control buttons

Hi,

I am new to audacity and not able to find out the option or the setting for issue.
Actually I am facing issue when I open any effect window I am not able to play tracks live its not allowing to play. As you can see in the given screen shot.

So please let me know how cam I able to play live preview while effect windows is on and according to edit my project. In the effect preview button is not useful when sometime you need to edit live things and adjust it while track is running live.

So please let me know the solution for it.