Kaltura_Client_Exception thrown

Invalid KS "N2QxZDBhNjYxODU2MjljNTc0ZTQ2NDliOTdmMWZmZDE0MGY0ZTFlMnwxMDE7OzE0NzUwNzE4OTk7MjsxNDc0OTg1NDk5LjIyNzk7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"