If the admin sections in Theme Options do not open. Most likely you do not have mbstring installed. Crane theme options based on the Redux Framework which needs mbstring, also it need for WooComerce, WPBakery and Massive Addons.
What is MBSTRING
Mbstring stands for multi-byte string functions. Mbstring is an extension of php used to manage non-ASCII strings. Mbstring is used to convert strings to different encodings. Multibyte character encoding schemes are used to express more than 256 characters in the regular byte wise coding system. Mbstring provides multibyte specific string functions that help us to deal with multibyte encodings in PHP. Mbstring handles character encoding conversion between the possible encoding pairs. Mbstring is designed to handle Unicode-based encodings such as UTF-8 and UCS-2 and many single-byte encodings for convenience PHP Character Encoding Requirements.
byte encodings for convenience PHP Character Encoding Requirements.