Kaltura_Client_Exception thrown

Invalid KS "ZjY2MWYyY2UzM2I5Y2I4ZWUzNzk2ODFkZDc1Y2YxN2ZiMDYzOWI3ZnwxMDE7OzE0NzQ5ODAyNDg7MjsxNDc0ODkzODQ4LjA2Mzc7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"