Kaltura_Client_Exception thrown

Invalid KS "MmMyZDBjMGQzOWFlOWMwMjEwMTIzMjkyYWJiNTk5NWM3YmRiMWQ2MHwxMDE7OzE0OTU1NjgyNDk7MjsxNDk1NDgxODQ5LjczNDg7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"