We encourage all EF3 Framework users to update the framework plugin to the latest version.
Keep reading to find out why you should update the plugin.
Joomla 3.5 has a new version of the LESS compiler that could lead to the LESS parse error when the Developer Mode was enabled in the template parameters:
We had to update our EF3 Framework files to force using our built-in compiler to compile LESS files to CSS. After updating the plugin, you should get rid of the LESS parser error and you may enjoy Joomla 3.5 running smoothly with EF3 Framework.