Kaltura_Client_Exception thrown

Invalid KS "MjUxYTM4ODE5YTE2NTAxOGE5ZmE1YTNlNjAwYmE1YzA3MGIwMzY2OHwxMDE7OzE0NzQ4NTcwNTE7MjsxNDc0NzcwNjUxLjgxOTc7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"