Kaltura_Client_Exception thrown

Invalid KS "MmM0ZWJlMzhmZTJjMmJkOTg3MjdmMjg1NDQzMGM5MmJiNjE5Y2JmZHwxMDE7OzE0NjcwMzYxMTc7MjsxNDY2OTQ5NzE3LjMzNDE7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"