Kaltura_Client_Exception thrown

Invalid KS "YTc2ODdhZTQ1NDcyMjU3NWY4MjFmOTRkMjQxNDZiZDk2MzAwYzJhNHwxMDE7OzE1MDExMDIyNTg7MjsxNTAxMDE1ODU4LjE5OTk7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"