Kaltura_Client_Exception thrown

Invalid KS "MDgwOGUzODA3YzJlOWU5ODU5YjBjMzI3OTg4MGRmZmQyZDEyNmU5MnwxMDE7OzE0OTg1NTk3NTk7MjsxNDk4NDczMzU5Ljc1Mjc7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"