As standard practice the editor look for a CSS file called “template.css” in the template CSS folder.  If your template uses a differently file name for your CSS style-sheet or your style-sheet is located in a different folder you would have received the “Warning: css/template_css.css does not appear to be a valid file...” error message.

The solution

The solution is simply to configure the editor to look at your custom style-sheet. To do this go to 'Extensions' and click on ‘Plug-in Manager’ > and select and open the 'JoomlaCK' Plug-in.

• JoomlaCK Editor Plug-in Parameters JoomlaCK Editor Plug-in Parameters
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In the editoris plugin you will see a set of parameters on the right:

• Set the “Use Template CSS classes?” to NO
• Set the “Use Editor CSS classes?” to NO
• In the “Use Custom CSS Classes?” field, place the pathway to your CSS file, It will normally look something link this: templates/yourtemplatename/css/cssfile.css) and press Save.