Dediux on "[Plugin: OptionTree] Error when "Theme Mode" is true"

Hi to all,

I'm new to OptionTree. I installed the plug-in, then I downloaded the code and I put it into my theme's folder.

When the "Theme Mode" is on, via functions.php, I get a lot of errors like these:

Warning: include_once(C:\xampp\htdocs\ambassador/wp-content/themes/ambassador/wp-content/plugins/option-tree/includes\ot-functions-admin.php):failed to open stream: No such file or directory in C:\xampp\htdocs\ambassador\wp-content\plugins\option-tree\ot-loader.php on line 487

Warning: Cannot modify header information - headers already sent by (output started at C:\xampp\htdocs\ambassador\wp-content\plugins\option-tree\ot-loader.php:487) in C:\xampp\htdocs\ambassador\wp-content\plugins\toolset-module-manager\common\Settings.php on line 78

Warning: call_user_func_array() expects parameter 1 to be a valid callback, function 'ot_register_theme_options_page' not found or invalid function name in C:\xampp\htdocs\ambassador\wp-includes\plugin.php on line 470

My theme is based on Underscores.me.

What could be the problem? Anyone has the same issue?

https://wordpress.org/plugins/option-tree/