Kaltura_Client_Exception thrown

Invalid KS "Y2I2Mzk5N2Q3ODk2NzU0MTJjYmUwMDAxMTJiODEzODkzMjQ1ZjY3MXwxMDE7OzE0ODExMTk3MTA7MjsxNDgxMDMzMzEwLjgwNjM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"