If you get an error you do not understand, then the first thing to do is throw it to Google:
MMC could not create the snap-in[
^]
A quick glance shows a number of people with similar problems, at leats one of which has teh same CSLID:
MSDN[
^]
Have a look at those, and either it will solve your problem, or you will have actual information to add to your question.
In future, please try to do at least basic research before posting, and save your time and ours...