Kaltura_Client_Exception thrown

Invalid KS "YjM0NWMzOTdjYmM3MjIwOGU5MTdhZWY5ZmJjZDZiZGU3ODUyNzUzMHwxMDE7OzE0NzIxMjgzOTY7MjsxNDcyMDQxOTk2Ljc1NTI7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"