Kaltura_Client_Exception thrown

Invalid KS "ZjRlNTBlYWU1YzM5ZjFlODc2NjBiODM0OTM3OGE3YTE3MWExYWQyMnwxMDE7OzE0NzUwNjYwMzE7MjsxNDc0OTc5NjMxLjE1NTE7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"