Kaltura_Client_Exception thrown

Invalid KS "MjQ4ZmRmZWQ3ZjMwODI1YTZiOTZhYmYzOTk5NTQwNDMzYTIxOTJiZHwxMDE7OzE0OTg1MjMzMTU7MjsxNDk4NDM2OTE1LjA1NzI7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"