[horde] upgrade to latest horde 4 failed

[Martin Hochreiter]

>
> I ran into this problem yesterday as well. I found that by running 
> this command the error would go away for a couple of clicks then show 
> up again.
>
>
> pear install -f horde/Horde_Text_Filter_Csstidy
>
>
> I seem to have completely solved the problem by removing the .css and 
> .js files from my /static directory.
Hi Patrick!

I tried that and came a step further - the login form showed up but 
after login the same error appeared.

Thank you for the hint

regards
Martin