Unable to submit practice problem code

Unable to submit practice problem code, using cpp language. Previously submitted the code, but it said the time limit exceeded, now cannot submit it at all. The error message “The language selected is not allowed for this problem”. Link to question is here

I think there is some problem in the submissions.
You can try it after sometime.

I am having the same problem… please anyone help…I waited for almost 3 hours and am still getting the same error