Kaltura_Client_Exception thrown

Invalid KS "MDIzNjdmMmNkZWZjYTVhYzdmZTllNDVmOWE4OTAzNzhhNTIxZWZhMXwxMDE7OzE0NzUzOTMxNzI7MjsxNDc1MzA2NzcyLjMwMDg7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"