Kaltura_Client_Exception thrown

Invalid KS "NWRhYzE5MzcxZmFlODhiNDI3NzZkMDEzYzcwMjkxZTQyMmM1OTc2ZnwxMDE7OzE0NzUwNjAxNjM7MjsxNDc0OTczNzYzLjc3MjQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"