Kaltura_Client_Exception thrown

Invalid KS "NTcxZGQ4ZGYzYjkxNDAwNTcxYmUxMjg5OWI0NWFmOGE5MzBmNTRhYnwxMDE7OzE0NzU0Mjk0NjQ7MjsxNDc1MzQzMDY0LjczMTg7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"