Hi,
I have faced the same issue. But I solved this problem. Please go to Administration > Site administration > Appearance > Default Dashboard page > add calendar block and upcoming event block along with course overview block and browse your student dashboard page. You can see the error is gone.
If this issue occurs for particular user he / she customize his/her dashboard page and add calendar block and upcoming event block along with course overview block.
Hope this helps you.
Thanks and regards,
Sandipa Mukherjee