Warning:Choose valid language

[W-X-Dai]

When I enter "cf submit", it returns the warning of "Choose valid language" which hadn't occur before.

[youkeliao]

Me too. I think it might that the language can not be used. But I try to set a new template. After it, I still can not solve this problem.

[W-X-Dai]

Me too. I think it might that the language can not be used. But I try to set a new template. After it, I still can not solve this problem.

perhaps codeforces change its api?

[fedimser]

I had the same problem. Codeforces changed its set of languages, removing the one that I was using in my template.

The quick fix:

• Go to https://codeforces.com/contest/1956/submit (or any other contest) and inspect Language dropdown using your browser developer tools - you'll see list of languages and their ids.
• Go to https://github.com/xalanq/cf-tool/blob/master/client/langs.go - this is a list of languages hardcoded into cf-tool
• Find ID for your language that appears in both lists. For C++, the best choice as of today is 54 - GNU G++17 7.3.0.
• Use cf config to delete your old template, then create the new template (instructions for CP editor) and chose language ID from previous step.