Default Problems with system wide local proxy

Hello community,

I want to set up a system wide proxy running local on my galaxy s4 (gt-i9505) with android 4.3.
I have installed the app 'Filter Proxy':

If i add the proxy in wifi settings/proxy settings it's running without problems. But when I want to add the proxy as a system wide proxy with 'ProxyDroid' or 'Proxy Manager' there is a problem: In browser I get the following message: socket failed: EMFILE (Too many open files)

Proxy Manager:

Any ideas?