Kaltura_Client_Exception thrown

Invalid KS "ZGEzZDIzMDEwNDkyZjJkY2MxMzE4NGE2NDU1NGYzM2I1ZmJjYzhmOXwxMDE7OzE0OTM1MzczMTM7MjsxNDkzNDUwOTEzLjY0Njg7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"