Sth wrong when I am useing ngram on the server.

Hi ya,
I am trying to use n-gram on the server. The n-gram is located in “D:\LanguageTool\en”.
I have input

“java -Xmx500m -cp languagetool-server.jar org.languagetool.server.HTTPServer --port 8081 --languageModel 'D:\LanguageTool'”

in cmd and when I input
'http://localhost:8081/v2/check?language=en-Us&text=“Let us go their.” in Chrome, it does not work, and the chrome just returns
{“software”:{“name”:“LanguageTool”,“version”:“4.9”,“buildDate”:“2020-03-24 14:19”,“apiVersion”:1,“premium”:false,“premiumHint”:“You might be missing errors only the Premium version can find. Contact us at supportlanguagetoolplus.com.”,“status”:“”},“warnings”:{“incompleteResults”:false},“language”:{“name”:“English (US)”,“code”:“en-US”,“detectedLanguage”:{“name”:“English (US)”,“code”:“en-US”,“confidence”:0.70801944}},“matches”:}
So, what could I do and how to solve this problem? Thank you.

However, when I am useing LT UI verision. it works well the UI told me “their” is correct.

There was an issue with the ngrams in the 4.9 release. Could you try with this snapshot? https://internal1.languagetool.org/snapshots/LanguageTool-20200327-snapshot.zip

A 4.9.1 release will hopefully fix this in a few days.