Can't create forums in forum groups

I managed to install the forum on a clean D7.0.3 install. I even managed to create groups and forums. But then I made mistake and had to delete a group. From then on I can't create forums in groups anymore. I always get next error :

Warning: XSLTProcessor::importStylesheet() [xsltprocessor.importstylesheet]: /home/../public_html/LEDEN/modules/boonex/forum/layout/base_nl/xsl/edit_forum_form.xsl:58: parser error : Input is not proper UTF-8, indicate encoding ! Bytes: 0xE9 0x0A 0x20 0x20 in /home/../public_html/LEDEN/modules/boonex/forum/classes/nl/BxXslTransform.php on line 87

Warning: XSLTProcessor::importStylesheet() [xsltprocessor.importstylesheet]: priv�n /home/../public_html/LEDEN/modules/boonex/forum/classes/nl/BxXslTransform.php on line 87

Warning: XSLTProcessor::importStylesheet() [xsltprocessor.importstylesheet]: ^ in /home/../public_html/LEDEN/modules/boonex/forum/classes/nl/BxXslTransform.php on line 87

Warning: XSLTProcessor::importStylesheet() [xsltprocessor.importstylesheet]: compilation error: file /home/../public_html/LEDEN/modules/boonex/forum/layout/uni_nl/xsl/edit_forum_form.xsl line 3 element include in /home/../public_html/LEDEN/modules/boonex/forum/classes/nl/BxXslTransform.php on line 87

Warning: XSLTProcessor::importStylesheet() [xsltprocessor.importstylesheet]: xsl:include : unable to load /home/../public_html/LEDEN/modules/boonex/forum/layout/base_nl/xsl/edit_forum_form.xsl in /home/../public_html/LEDEN/modules/boonex/forum/classes/nl/BxXslTransform.php on line 87

Warning: XSLTProcessor::transformToXml() [xsltprocessor.transformtoxml]: No stylesheet associated to this object in /home/../public_html/LEDEN/modules/boonex/forum/classes/nl/BxXslTransform.php on line 88

I compiled my forum languages and now my entire site is turning back into english language file, while standard language is dutch.

This is really shit !!!

I wish I never installed that Orca Forum module ...

Problem solved.

Forum management has to be done in standard English site language settings. I tried to do it in standard dutch site language and that's why I received the error.

Orca Forum language file is not using UTF-8 encoding, you can try to fix it, by downloading Orca language file:

/boonex/forum/integrations/base/langs/XX.php

open it is some editor which allow to change file encoding, save it using UTF-8 encoding and upload back to the server, then try to compile Orca language file.

Hope it helps.