Kaltura_Client_Exception thrown

Invalid KS "MjRjNWU0NGQ4MDE2ZjNlNDllYzhhN2UwNWMzY2M1NTk0ZTZjMGEyNnwxMDE7OzE0NzUzODAxOTk7MjsxNDc1MjkzNzk5Ljc0O0Fub255bW91cztlZGl0Oio=", Error "-1,INVALID_STR"