Kaltura_Client_Exception thrown

Invalid KS "ZWU3NDRiMzkzZWZjMDQ2YTliNWU5ZmUzMzkzZmUxOTBmZDkzODhjMHwxMDE7OzE0NzUyNjMyNjU7MjsxNDc1MTc2ODY1LjQ4MTQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"