Kaltura_Client_Exception thrown

Invalid KS "ZjY4NjU5MjVkYWY4YjVmOGRiYWMzZTUzNmViOTQ2NmFmNmM2NDY4MXwxMDE7OzE0NzUzNzkyNzk7MjsxNDc1MjkyODc5LjYyMTQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"