Kaltura_Client_Exception thrown

Invalid KS "OTYyMGJiMTBhZWUzNDQzMjMyYWZjNWQ2NWM0NWFkOGFlMjNiNDMxZnwxMDE7OzE0NzU0MDYzOTM7MjsxNDc1MzE5OTkzLjM2Nzk7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"