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Problems setting up LT with Texstudio

I have this error when using LT together with Tex Studio. I tried setting the classpath but without success.
I am using Linux mint 17.2, Java 8 and TexStudio 2.6.6
Any idea what I need to do or what might be the issue. Google didn’t help me unfortunately. Thx a lot.
Stacktrace from the server:

2016-05-12 15:52:53 An error has occurred. Access from, text length 28. Stacktrace follows:
java.lang.IllegalArgumentException: ‘’ is not a language code known to LanguageTool. Supported language codes are: ast-ES, be-BY, br-FR, ca-ES, ca-ES-valencia, da-DK, de, de-AT, de-CH, de-DE, de-DE-x-simple-language, el-GR, en, en-AU, en-CA, en-GB, en-NZ, en-US, en-ZA, eo, es, fa, fr, gl-ES, is-IS, it, ja-JP, km-KH, lt-LT, ml-IN, nl, pl-PL, pt, pt-BR, pt-PT, ro-RO, ru-RU, sk-SK, sl-SI, sv, ta-IN, tl-PH, uk-UA, zh-CN. The list of languages is read from META-INF/org/languagetool/ in the Java classpath. See for details.
** at org.languagetool.Languages.getLanguageForShortName(
** at org.languagetool.server.LanguageToolHttpHandler.getLanguage(**
** at org.languagetool.server.LanguageToolHttpHandler.checkText(**
** at org.languagetool.server.LanguageToolHttpHandler.handle(**
** at$Chain.doFilter(**
** at**
** at$Chain.doFilter(**
** at$Exchange$LinkHandler.handle(**
** at$Chain.doFilter(**
** at$**
** at java.util.concurrent.ThreadPoolExecutor.runWorker(**
** at java.util.concurrent.ThreadPoolExecutor$**
** at**

Hi Thomas, for some reason the language parameter is missing. Do you have set a language for your text? Maybe you’re lucky and someone has an idea, but it’s probably something the Texstudio developers can better help with.

Thx for your reply. I have already checked that. My language is set to english in Texstudio.

Ok, I could solve it. The problem was, I used version 2.6.6 from package manager. Using version 2.10 from solved this issue.