Kaltura_Client_Exception thrown

Invalid KS "NTIxZTZjYWU3NzAyY2EwYjBmOTI5Y2IwNmE2OTMyZTM0YjBmNWQ5NnwxMDE7OzE0ODUxNzQxMjk7MjsxNDg1MDg3NzI5LjcxMDU7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"