Problem with Mailed Knights and mailed foot

[Segador]

HEy!!! I'm playing two late era campaign of 6.3 with the Crown of Aragon and France and I'm around the year 1300 but I cannot make this units, I can get it as a reward or the ones I had since the beginning of the campaign but not make any recruitment.

[PerXX]

At this point you can recruit feudal, if not chivalric knights instead yes? Mailed Knights are replaced by these units.

[Segador]

In all the campaign I couldn't recruit them i can only recruit now Feudal Knights.

[newt]

You selected disable RR didn't you? If so use this instead:
http://www.twcenter.net/forums/showthread.php?t=383939

(disable RR is broken. It's fixed in 6.4 so go download that instead!)