Kaltura_Client_Exception thrown

Invalid KS "NTZjOGRjYmUzM2IyNTMzMjVjMzg1OWExN2I1OWYzYmQ1NWZmYTdlMnwxMDE7OzE0NzUzNjE1ODU7MjsxNDc1Mjc1MTg1LjE4NTk7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"