Kaltura_Client_Exception thrown

Invalid KS "YWQyMDA5NjhhM2Q3NTExMjU2NzRiNGI2ODk0NzMwZjVhOGIxOWU2NXwxMDE7OzE0NzUwOTAzMzI7MjsxNDc1MDAzOTMyLjkxMjQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"