Kaltura_Client_Exception thrown

Invalid KS "OThmMTNiYzY2MDE0YmZhZjU0YjVlMTQ5MmU0YTI4NTU3MjViYmVjN3wxMDE7OzE0NzUyMjAxNTQ7MjsxNDc1MTMzNzU0LjUwNDg7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"