Getting a --level message when running GrammarousCheck

[theoldinternet]

I'm trying to get Grammarous running, and I ran into this error when I run :GrammarousCheck.

my init.vim looks like this:

call plug#begin()
Plug 'rhysd/vim-grammarous'
call plug#end()

[trappmartin]

Have the same issue, strangely enough this is technically just the last line in the usage message of language tools. I guess something in the execution goes wrong.

https://github.com/languagetool-org/languagetool/blob/9ca673bf53b6aaf3e2830e8e92a5794a1659a7db/languagetool-commandline/src/main/java/org/languagetool/commandline/CommandLineParser.java#L227

[Plasny]

Having the same issue. After checking :messages it says that the languagetool doesn't have --api parameter.

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Edit:
Same issue as #110, which proposes a fix that worked for me :)