Hi mexa,
How much are you using Kunena version? This error appear on Kunena version 4.0.5 and fixed on Kunena version 4.0.6. I tried to install the NTS KSliver template on Kunena 4.0.6 and Joomla 3.4.5, it worked fine.
Please try to update the Kunena latest version if you are using old version.
Best regards,
Huyen Nguyen
Nice Theme Store's Support Department.
Support email: 9themestore[at]gmail.com
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