Important Installingkunena 1.6 Alpha is showing an error on line 402

my site www.thengapattanam.net
discusiion Forum link is Discussion Forumhttp://thengapattanam.net/index.php?option=com_kunena&Itemid=5


I tried to install kunena latest 1.6 alpha version after installing the upgrade of joomla 1..18 from 1.5.15.

the site is working fine.

but the discussion forum is still having trouble.

after opening the discussion forum it is showing the following error.


PHP Warning: Invalid argument supplied for foreach() in \HostingSpaces\thengapa\thengapattanam.net\wwwroot\administrator\components\com_kunena\install\model.php on line 402

the above error on line 402 is in administrator backend.


but in the front end the error is

The Forum is currently offline for maintenance
Check back soon!

The following (see attached image) is the error when navigating to other link after installing the kunena with the error
PHP Warning: Invalid argument supplied for foreach() in \HostingSpaces\thengapa\thengapattanam.net\wwwroot\administrator\components\com_kunena\install\model.php on line 402

the error is only after login to the site...

Thank you for reporting your problem with K 1.6.0a. As we have said on numerous occasions K 1.6.0a is not for use on production sites. Please restore your site from the backup you made before you installed K 1.6.0a. Thank you.

Hello,

There are some errors in alpha1 which will be fixed in alpha2, you will can try this soon.