market was unavailable in feudal age but I could build in castle age

What now?

Ah, right! We've only disabled the feudal one.

Repeat the process of defining the unit and moving the train button for units 116 and 137 as you did for unit 84. Remember to change the names to castle and imperial market so you have three different units modified.

ok thanks

Is it like this?

#const DARK_AGE_MARKET 84
#const FEUDAL_AGE_MARKET 116
#const CASTLE_AGE_MARKET 134
<PLAYER_SETUP>
random_placement
nomad_resources
ai_info_map_type NOMAD 1 0 0
effect_amount SET_ATTRIBUTE DARK_AGE_MARKET ATTR_TRAIN_BUTTON 255
effect_amount SET_ATTRIBUTE FEUDAL_AGE_MARKET ATTR_TRAIN_BUTTON 255
effect_amount SET_ATTRIBUTE CASTLE_AGE_MARKET ATTR_TRAIN_BUTTON 255

yes, that should be it. Plus the two constants for SET_ATTRIBUTE and ATTR_TRAIN_BUTTON

we were unable to build the market, but the barbarians are still able to build the market!! Could you help me out!

what do you mean barbarians? The AI?

Try to add also that the market is not built by a villager anymore:

Yes, the AI

Then try the train location thing. It's likely that the AI doesn't need the buttons to play and that's why it could still access the market. By removing the building from the villagers, it should be definitive.

How to do that? I mean how to make villagers get removed from building market?

This:

ok sorry. I just replaced 255 with -1, forgot abt changing button to location

No, But they are still building market, should I put both train button and train location?