Hello, when I add a category, the module gives me the following error:

Fatal error: Call to undefined function mb_internal_encoding() in D:\Inetpub\webs\*********\****\administrator\components\com_k2\tables\k2category.php on line 87

I do not understand on what comes! I feel that there is a week ... help

your server needs to have the multibite encoding turned on...contact your host to have this done.

Verify the status by looking at the information tab of K2 dashboard