Hello,i have a problem with my TARDIS.I have use Levers to turn on/off the TARDIS light's,but the Panel(i don't know the name)say that the TARDIS have a problem.What i do to solve the problem?

Could you please say where you are experiencing the issue, and what the panel looks like?

Could you please provide screenshots and a better description with proper grammar so we can understand you?

The panel is not with green letters and black background,instead,is with white letters and blue background.

Just exit and reenter the TARDIS. If that doesn't fix it, break and replace it with a pickaxe

the problem is in the TARDIS Wall Display

 But why this happen?

 Don't worry about it, it's just a bug.