Fixed on Beta: [36334] Military building unit slots Internal Error

[Achaeus]

1) Reproduction Steps
a) Select Heavy Calvary Stable
b) Select 3rd Unit to Train
c) Internal Error pop up box displays

2) Every time I try to train the 3rd Unit in my Heavy Calvary Stable I get an Internal Error and need to reboot the game.
a) Reproduced 10/10 times
b) Independent of previous tasks or steps
c) Expected to be able to train Unit
d) Unexpected Internal Error occurred

1.81.be5a1b0 (11.07.2016 8:34)
Achaeus (127556)
zz1, en_US
WIN 22,0,0,192
Windows 7
MSIE 11.0
1920x885, DirectX9Ex (336 MB VRAM)

I performed a search of the Forum using:
Heavy Calvary Internal Error
Heavy Calvary Error
Heavy Calvary
Internal Error
Error
Calvary Error

 

[Macha]

same happens with industrial riflemen and opening the 4th slot

 

[thephantom]

It does not appear to be specific to any military buildings or ages, it affects all military slots that you have yet to 'open' (or buy).

 

[DeletedUser7570]

Same happens to me in early middle ages with catapult camp and infantry barracks