iPad error trying to access the ACP with Safari

[Don Bartholomew]

I am using an iPad/Safari browser.
I enter the URL to acces the observatory and it gives me the logon screen.
After I enter the logon there is a moment of waiting then the site tells me that
it has loaded all of the plug-ins but one: ModeSwitchPlugin.
The error: SyntaxError: Parse Error.
It gives me 2 options: Forced or Disabled.
How should I proceed?