Kaltura_Client_Exception thrown

Invalid KS "Njc2M2ZiMDlhYjA5YWRjNTE4MWEzNTdjYmFhM2Y5YzM0NTRhMmJkNHwxMDE7OzE0NjcwNjg0NTQ7MjsxNDY2OTgyMDU0LjQxOTc7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"