Kaltura_Client_Exception thrown

Invalid KS "OTA5ZjZlNWU1MmFkOTg1ZjM4MmJhMDc5N2U5MTczNTM3NDhmMTUxNHwxMDE7OzE0NzUyNzQ3NDE7MjsxNDc1MTg4MzQxLjI1MzU7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"