How to Fix Stikked "The URI you submitted has disallowed characters." Error

"The URI you submitted has disallowed characters."
This happens due to Code Igniter has strict policy about what characters it allows in URLs.

However this can be fixed as follows.

vim system/config/config.php

in Stikked folder and
comment $config['permitted_uri_chars'] = 'a-z 0-9~%.:_\-';
by adding # infront of it as follows.

# $config['permitted_uri_chars'] = 'a-z 0-9~%.:_\-';