Kaltura_Client_Exception thrown

Invalid KS "YmIzZmMxMTZiOWIwZGI3NGNiNzVmZTlmYjQ4MjI0YTY2MzQ5Yzk1MHwxMDE7OzE0NzQ5MTI0NTc7MjsxNDc0ODI2MDU3LjczMTE7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"