Kaltura_Client_Exception thrown

Invalid KS "ZDIwMWI2ZDYzMTQwZDcyYjI3NDhhYzk4ZjYzYzIzMTY3Mjc2NDcxOHwxMDE7OzE0NzQ5MTI0MzA7MjsxNDc0ODI2MDMwLjAzNjM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"