Kaltura_Client_Exception thrown

Invalid KS "ZmFkYzU2ZDI4N2E3YjVmNzM0ZDU0OTg5YWU4MTU1ZjEyNjFlOWM5MHwxMDE7OzE0NzI3NDcxNzI7MjsxNDcyNjYwNzcyLjY3MzU7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"