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rust-analyzer.run gives error “Invalid channel id”

See original GitHub issue

Here’s the CocOpenLog output:

2020-08-27T07:56:04.463 INFO (pid:289844) [services] - registered service "rust-analyzer"
2020-08-27T07:56:04.465 INFO (pid:289844) [services] - Rust Analyzer Language Server state change: stopped => starting
2020-08-27T07:56:04.469 INFO (pid:289844) [language-client-index] - Language server "rust-analyzer" started with 289862
2020-08-27T07:56:04.478 INFO (pid:289844) [services] - Rust Analyzer Language Server state change: starting => running
2020-08-27T07:56:04.490 INFO (pid:289844) [services] - service rust-analyzer started
2020-08-27T07:56:04.503 INFO (pid:289844) [plugin] - coc.nvim 0.0.78-9f9d8a32c4 initialized with node: v10.19.0 after 284ms
2020-08-27T07:56:11.051 ERROR (pid:289844) [server] - unhandledRejection  Promise {
  <rejected> Error: request error nvim_call_function - Vim(return):E900: Invalid channel id
      at transport.request (/home/ubuntu/.vim/plugged/coc.nvim/build/index.js:15216:32)
      at pending.set (/home/ubuntu/.vim/plugged/coc.nvim/build/index.js:11881:13)
      at NvimTransport.parseMessage (/home/ubuntu/.vim/plugged/coc.nvim/build/index.js:11822:17)
      at DecodeStream.NvimTransport.decodeStream.on (/home/ubuntu/.vim/plugged/coc.nvim/build/index.js:11792:18)
      at DecodeStream.emit (events.js:198:13)
      at addChunk (_stream_readable.js:288:12)
      at readableAddChunk (_stream_readable.js:269:11)
      at DecodeStream.Readable.push (_stream_readable.js:224:10)
      at DecodeStream.Transform.push (_stream_transform.js:151:32)
      at DecodeBuffer.DecodeStream.decoder.push (/home/ubuntu/.vim/plugged/coc.nvim/build/index.js:14764:12) } Error: request error nvim_call_function - Vim(return):E900: Invalid channel id
    at transport.request (/home/ubuntu/.vim/plugged/coc.nvim/build/index.js:15216:32)
    at pending.set (/home/ubuntu/.vim/plugged/coc.nvim/build/index.js:11881:13)
    at NvimTransport.parseMessage (/home/ubuntu/.vim/plugged/coc.nvim/build/index.js:11822:17)
    at DecodeStream.NvimTransport.decodeStream.on (/home/ubuntu/.vim/plugged/coc.nvim/build/index.js:11792:18)
    at DecodeStream.emit (events.js:198:13)
    at addChunk (_stream_readable.js:288:12)
    at readableAddChunk (_stream_readable.js:269:11)
    at DecodeStream.Readable.push (_stream_readable.js:224:10)
    at DecodeStream.Transform.push (_stream_transform.js:151:32)
    at DecodeBuffer.DecodeStream.decoder.push (/home/ubuntu/.vim/plugged/coc.nvim/build/index.js:14764:12)