Uncaught exception: Header must contain a Content-Length property

I’ve been a bit frustrated with this error since months at this point. I can’t find a proper way to reproduce and logs do not help: maybe someone here knows better than I do.

This causes the plugin to completely stop working, vim becomes slow and I get a ton of error messages:

CocInfo output:

undefined## versions

vim version: NVIM v0.5.0-828-g0a95549d6
node version: v15.2.1
coc.nvim version: 0.0.79-9eb7e5b2ae
coc.nvim directory: /home/eruizc/.config/nvim/plugged/coc.nvim
term: alacritty
platform: linux

## Log of coc.nvim

2020-12-10T18:16:26.003 INFO (pid:145067) [plugin] - coc.nvim 0.0.79-9eb7e5b2ae initialized with node: v15.2.1 after 354ms
2020-12-10T18:16:27.563 INFO (pid:145067) [language-client-index] - Language server "cs" started with 145137
2020-12-10T18:16:32.974 ERROR (pid:145067) [server] - uncaughtException Error: Header must provide a Content-Length property.
    at StreamMessageReader.onData (/home/eruizc/.config/nvim/plugged/coc.nvim/build/index.js:18138:27)
    at Socket.<anonymous> (/home/eruizc/.config/nvim/plugged/coc.nvim/build/index.js:18123:18)
    at Socket.emit (node:events:329:20)
    at addChunk (node:internal/streams/readable:304:12)
    at readableAddChunk (node:internal/streams/readable:279:9)
    at Socket.Readable.push (node:internal/streams/readable:218:10)
    at Pipe.onStreamRead (node:internal/stream_base_commons:192:23)
## From here the previous exception repeats

After 5 seconds of opening the solution I already have a log with +5000 lines of the previous exception with a difference of 1 to 200 milliseconds between each.

It works fine in some projects (specially small ones) and currently breaks in 2 of my company projects. It used to work originally in both of them but now it’s completely dead.

What do these projects share that others do not?

• ASP.NET Core (2.1 and 3.1)
• Private repo
• Uses private nuget packages from github

[raymonddavis]

@ennmichael I just encountered this and fixed mine by running dotnet clean. Seems it is picking up the build dlls maybe?

[ProgrammingLife]

I’ve fixed this with some strange solution. As it happened with the Unity project I’ve done this: rm MyUnityProject/obj/Debug/* There are two project .cache-files. After that my coc-omnisharp seems to be working now but how much time it will work - I don’t know. VSCode had been loading that “broken” project without any problems. Maybe it’s not a broken project but some file format that coc-omnisharp can’t read properly.