Kaltura_Client_Exception thrown

Invalid KS "YzdmYmVkMmM5MTViNWExOTUwMjU4ZDNiNGMyOGViZjcwNmFkYTE1ZHwxMDE7OzE0OTg3OTAxNTk7MjsxNDk4NzAzNzU5LjE2NDE7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"