Kaltura_Client_Exception thrown

Invalid KS "MmNlNDk1Mjc1ZDY5MTk3MWUwOTVkYzE2MTk3MTEyMzlmZTJhODU3ZHwxMDE7OzE0NzUyODc2NDY7MjsxNDc1MjAxMjQ2LjQwOTU7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"