I have already expanded the appearance, broken the symbol link of the halftone patterns and ungrouped it. I want to fill up with several colors using random color fill script but it's not working.
Your paths are all in a clipping mask.
Go to the Layers Panel (F7) and you'll see that;
- Your paths are in a clipping mask.
- You have extra paths.
Delete the extra paths, then select the main group and Right Click → Release Clipping Mask (Ctrl+Alt+7)
You now have to delete the extra "clipping path" (it will be a rectangle shape) above all your other shapes.
Now select all and apply your random colors.