categories

I have changed the name of the "Uncategorized" category, not knowing this wasn't allowed. Now I have problems with showing the categories in the frontend. Via Joomla extension manager, I de-installed the easyblog file. After that I installed again the easyblog file. Now I have the same categories as in the beginning without the "Ungcategorized" cat. I don't know also with cat was the original one. What to do?

regards

derk