If the clutch were not adjusted and this problem existed you'd get grinding while trying to find first or reverse, they have no synchronizes. Without grinding then tells you the clutch is fully disengaged, and likely adjusted properly.
If you can't get it in gear from a stand still with clutch depressed could be because nothing is turning and the gears are meeting tooth to tooth, won't go in gear. but if your issue is still there when rolling or immediately after pushing the clutch in this isn't the issue.
Have you eliminated the above?
Do you have oil in the trans? Usually plain old not fancy 80W90 gear oil is OK.
