Kaltura_Client_Exception thrown

Invalid KS "NGNkMzQ2Zjk5MzA4Zjc2YTBhMDIxMGZkODc0NGRhOWUyZGEyNWZkMnwxMDE7OzE0NzUwMzQ5MTk7MjsxNDc0OTQ4NTE5LjY5OTU7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"