[eluser]Felix Cheruiyot[/eluser]
There is no problem with CI input library. I have done over 20 projects with both the 2.02 and older version and whenever I encounter such errors I try to figure it out in my code.
Example of a syntax error that generated the 'Disallowed Key Characters' message was:
<input type="text" name=idno_tf" />
The correct format should be:
<input type="text" name="idno_tf" />
Note: the "" enclosing idno_tf(Thats the difference);
I strongly object one to change the system files, you better use an older version if you feel the one you are using has a bug.
Just look a bit harder and testing every component well. You will certainly find where you went wrong.