Kaltura_Client_Exception thrown

Invalid KS "NjczMmI5MzlhOGViZTVkODEwNGMzNGM5YjEzYWI3NmI1NGIwN2IxNHwxMDE7OzE1MDExMDEzMTE7MjsxNTAxMDE0OTExLjkyNjE7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"