The language has multiple names (see e.g. http://memory-beta.wikia.com/wiki/Federation_Standard ); in this course, we've standardised on Federation Standard and English.
Can you be more specific?
What kind of exercise did you have? Listening, translating, fill in the blank, multiple choice, something else?
What exactly did you type or select? What was the result? How did the result differ from what you expected?
Did you check whether you got your capital i's I and your small L's l correct?
DIvI' has two capital i's and an apostrophe at the end; Hol has a lowercase L at the end.
Can you type here exactly what you typed?
Or, even better, show us a screenshot of your answer being rejected? (Upload the screenshot to a website somewhere, such as imgur, and then include the URL to the image in your comment here.)
Did you perhaps mix up your i's and your L's? (See the other comments on this page.)