The Kunena team has announce the arrival of Kunena 7.0.2 [K 7.0.2] in stable which is now available for download as a native Joomla extension for J! 5.3.x/5.4.x/6.0.x. This version addresses most of the issues that were discovered in K 6.2 / K 6.3 / K 6.4 and issues discovered during the last development stages of K 7.0
for questions commonly asked or "how to" in nature (see the FAQs menu tab above);
for help with Kunena versions that are not the latest stable release; or
for general Joomla or website administration matters
You must include your K 2.0 configuration report; if you do not include your configuration report, your topic may be closed (locked) or deleted without any further warnings from the moderators.
K 2.0 support will cease on 31 August 2013 and this section of the forum will be closed and archived after that time and no further questions will be answered about this version.
Sticky
Fatal Error: Cannot pass parameter 2 by reference in components/com_kunena/lib/kunena.file.class.1.6.php on line 60
You are using customised HTTP error messages which basically stop anyone (including you) getting any information. I guessed that your problem arose after you tried to add an attachment. There's a known defect in K 2.0.0 which we're fixing. I used a development version of K 2.0.1 to temporarily give you back your website and I fixed the menu, too. Took me about 15 minutes.
If you want more details, ask me by PM and I will talk them through with you.