(FunctionClauseError) no function clause matching in XPExpert.ActiveProjects.active?/1

[simonmcconnell]

I am getting a lot of these. Does expert support multiple project workspaces yet?

2026-04-03 09:50:11.833 [info] [Info  - 9:50:11 AM] Received request textDocument/codeLens before engine for  was initialized. Ignoring.
2026-04-03 09:50:11.850 [info] [Info  - 9:50:11 AM] Received request textDocument/codeAction before engine for  was initialized. Ignoring.
2026-04-03 09:50:11.924 [info] [Info  - 9:50:11 AM] Received request textDocument/documentSymbol before engine for  was initialized. Ignoring.
2026-04-03 09:50:11.926 [info] [Info  - 9:50:11 AM] Received request textDocument/documentSymbol before engine for  was initialized. Ignoring.
2026-04-03 09:50:13.869 [info] [Info  - 9:50:13 AM] Received request textDocument/codeAction before engine for  was initialized. Ignoring.
2026-04-03 09:50:15.876 [info] [Error - 9:50:15 AM] ** (FunctionClauseError) no function clause matching in XPExpert.ActiveProjects.active?/1
    (xp_expert 0.1.0-3fe1565) lib/expert/active_projects.ex:91: XPExpert.ActiveProjects.active?(nil)
    (xp_expert 0.1.0-3fe1565) lib/expert/state.ex:147: XPExpert.State.apply/2
    (xp_expert 0.1.0-3fe1565) lib/expert.ex:403: XPExpert.apply_to_state/2
    (xp_expert 0.1.0-3fe1565) lib/expert.ex:218: XPExpert.handle_notification/2
    (xp_gen_lsp 0.11.3) lib/gen_lsp.ex:600: anonymous fn/2 in XPGenLSP.handle_notification_sync/3
    (xp_telemetry 1.3.0) /home/runner/work/expert/expert/apps/expert/deps/telemetry/src/telemetry.erl:324: :xp_telemetry.span/3
    (xp_gen_lsp 0.11.3) lib/gen_lsp.ex:599: XPGenLSP.handle_notification_sync/3
    (xp_gen_lsp 0.11.3) lib/gen_lsp.ex:502: XPGenLSP.loop/3
2026-04-03 09:50:15.876 [info] [Error - 9:50:15 AM] ** (FunctionClauseError) no function clause matching in XPExpert.ActiveProjects.active?/1
    (xp_expert 0.1.0-3fe1565) lib/expert/active_projects.ex:91: XPExpert.ActiveProjects.active?(nil)
    (xp_expert 0.1.0-3fe1565) lib/expert/state.ex:147: XPExpert.State.apply/2
    (xp_expert 0.1.0-3fe1565) lib/expert.ex:403: XPExpert.apply_to_state/2
    (xp_expert 0.1.0-3fe1565) lib/expert.ex:218: XPExpert.handle_notification/2
    (xp_gen_lsp 0.11.3) lib/gen_lsp.ex:600: anonymous fn/2 in XPGenLSP.handle_notification_sync/3
    (xp_telemetry 1.3.0) /home/runner/work/expert/expert/apps/expert/deps/telemetry/src/telemetry.erl:324: :xp_telemetry.span/3
    (xp_gen_lsp 0.11.3) lib/gen_lsp.ex:599: XPGenLSP.handle_notification_sync/3
    (xp_gen_lsp 0.11.3) lib/gen_lsp.ex:502: XPGenLSP.loop/3

[katafrakt]

It should support, I think (see #18). Do you use them? Can you share a bit more about the editor and the workspaces setup?

[simonmcconnell]

There are a handful of Elixir projects and a .NET project in the monorepo. When I was looking the Expert output I noticed there were only log messages about the first project in the monorepo.

It is the latest Expert and VSCode on Windows. I can get the details when I'm back at that PC.

[simonmcconnell]

There are 12 projects in the monorepo, 8 of which are elixir projects. I use a VS Code workspace to open most of them at once.

Expert was running before and not throwing this error.

2026-04-06 09:53:49.478 [info] Checking for nightly updates...
2026-04-06 09:53:51.102 [info] Latest release is tagged "nightly", published at 2026-04-05T00:36:42Z
2026-04-06 09:53:52.083 [info] Downloading new nightly release - checksum mismatch
2026-04-06 09:54:07.454 [info] Expert Language Server:
c:\Users\simon\AppData\Roaming\Code\User\globalStorage\expertlsp.expert\expert_windows_amd64.exe --stdio
2026-04-06 09:54:07.461 [info] Starting Expert in workspace r:\code\hubba\bubba
2026-04-06 09:54:16.081 [info] [l] Uninstalled older version (v0.1.0-3fe1565)

2026-04-06 09:54:16.867 [info] [Info  - 9:54:16 AM] Server initialized, registering capabilities
2026-04-06 09:54:16.882 [info] [Info  - 9:54:16 AM] [bubba] Starting project
2026-04-06 09:54:16.902 [info] [Info  - 9:54:16 AM] Opened file:///r%3A/code/hubba/hubba/lib/hubba/apps/cut/pancake.ex
2026-04-06 09:54:16.903 [info] [Info  - 9:54:16 AM] Opened file:///r%3A/code/hubba/hubba/lib/hubba/apps/cut/pancake/tag_job.ex
2026-04-06 09:54:16.911 [info] [Info  - 9:54:16 AM] Received request textDocument/documentSymbol before engine for  was initialized. Ignoring.
2026-04-06 09:54:16.937 [info] [Info  - 9:54:16 AM] Received request textDocument/codeAction before engine for  was initialized. Ignoring.
2026-04-06 09:54:16.937 [info] [Info  - 9:54:16 AM] Received request textDocument/codeAction before engine for  was initialized. Ignoring.
2026-04-06 09:54:17.149 [info] [Info  - 9:54:17 AM] Received request textDocument/codeLens before engine for  was initialized. Ignoring.
2026-04-06 09:54:17.150 [info] [Info  - 9:54:17 AM] Received request textDocument/codeLens before engine for  was initialized. Ignoring.
2026-04-06 09:54:17.174 [info] [Info  - 9:54:17 AM] Received request textDocument/documentSymbol before engine for  was initialized. Ignoring.
2026-04-06 09:54:17.175 [info] [Info  - 9:54:17 AM] Received request textDocument/documentSymbol before engine for  was initialized. Ignoring.
2026-04-06 09:54:19.079 [info] [Info  - 9:54:19 AM] [bubba] Using path: C:\Users\simon\AppData\Local\.burrito\expert_erts-15.2.7_0.1.0-728b76e\erts-15.2.7\bin;C:\Users\simon\AppData\Local\Programs\Microsoft VS Code;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;C:\WINDOWS\System32\OpenSSH\;C:\Program Files\Tailscale\;C:\Program Files\dotnet\;C:\Program Files (x86)\Windows Kits\10\Windows Performance Toolkit\;C:\Program Files\Git\cmd;C:\Program Files\PowerShell\7\;C:\Users\simon\go\bin;C:\Users\simon\scoop\apps\rustup\current\.cargo\bin;C:\Users\simon\scoop\apps\postgresql\current\bin;C:\Users\simon\scoop\apps\git\current\cmd;C:\Users\simon\scoop\apps\nodejs-lts\current\bin;C:\Users\simon\scoop\apps\nodejs-lts\current;C:\Users\simon\scoop\apps\openssl\current\bin;C:\Users\simon\scoop\apps\elixir\current\bin;C:\Users\simon\AppData\Local\Programs\Python\Python39\Scripts\;C:\Users\simon\AppData\Local\Programs\Python\Python39\;C:\Users\simon\scoop\shims;C:\Users\simon\AppData\Local\Microsoft\WindowsApps;C:\Users\simon\.dotnet\tools;C:\Users\simon\AppData\Local\Programs\Zed\bin;C:\Users\simon\AppData\Local\Programs\Microsoft VS Code\bin;C:\Users\simon\AppData\Local\JetBrains\Toolbox\scripts;C:\Users\simon\AppData\Local\Expert\;C:\Users\simon\AppData\Local\Programs\Swift\Runtimes\6.2.1\usr\bin\;C:\Users\simon\AppData\Local\Programs\Swift\Toolchains\6.2.1+Asserts\usr\bin\;C:\Users\simon\AppData\Local\Microsoft\WinGet\Links;C:\Users\simon\AppData\Local\Programs\Inno Setup 6;C:\Users\simon\AppData\Local\PowerToys\DSCModules\
2026-04-06 09:54:19.080 [info] [Info  - 9:54:19 AM] [bubba] Found elixir executable at c:/Users/simon/scoop/apps/elixir/current/bin/elixir.bat
2026-04-06 09:54:19.080 [info] [Info  - 9:54:19 AM] [bubba] Found erl executable at c:/Users/simon/scoop/shims/erl.exe
2026-04-06 09:54:19.080 [info] [Info  - 9:54:19 AM] [bubba] Preparing engine
2026-04-06 09:54:20.003 [info] [Info  - 9:54:20 AM] Received request textDocument/codeLens before engine for  was initialized. Ignoring.
2026-04-06 09:55:34.285 [info] [Info  - 9:55:34 AM] Received request textDocument/codeLens before engine for  was initialized. Ignoring.
2026-04-06 09:55:58.817 [info] [Info  - 9:55:58 AM] Received request textDocument/codeAction before engine for  was initialized. Ignoring.
2026-04-06 09:55:59.718 [info] [Info  - 9:55:59 AM] Received request textDocument/codeAction before engine for  was initialized. Ignoring.
2026-04-06 09:55:59.867 [info] [Info  - 9:55:59 AM] Received request textDocument/codeAction before engine for  was initialized. Ignoring.
2026-04-06 09:56:00.400 [info] [Info  - 9:56:00 AM] Received request textDocument/codeAction before engine for  was initialized. Ignoring.
2026-04-06 09:56:00.551 [info] [Info  - 9:56:00 AM] Received request textDocument/codeAction before engine for  was initialized. Ignoring.
2026-04-06 09:56:01.128 [info] [Error - 9:56:01 AM] ** (FunctionClauseError) no function clause matching in XPExpert.ActiveProjects.active?/1
    (xp_expert 0.1.0-728b76e) lib/expert/active_projects.ex:91: XPExpert.ActiveProjects.active?(nil)
    (xp_expert 0.1.0-728b76e) lib/expert/state.ex:147: XPExpert.State.apply/2
    (xp_expert 0.1.0-728b76e) lib/expert.ex:403: XPExpert.apply_to_state/2
    (xp_expert 0.1.0-728b76e) lib/expert.ex:218: XPExpert.handle_notification/2
    (xp_gen_lsp 0.11.3) lib/gen_lsp.ex:600: anonymous fn/2 in XPGenLSP.handle_notification_sync/3
    (xp_telemetry 1.3.0) /home/runner/work/expert/expert/apps/expert/deps/telemetry/src/telemetry.erl:324: :xp_telemetry.span/3
    (xp_gen_lsp 0.11.3) lib/gen_lsp.ex:599: XPGenLSP.handle_notification_sync/3
    (xp_gen_lsp 0.11.3) lib/gen_lsp.ex:502: XPGenLSP.loop/3
2026-04-06 09:56:01.128 [info] [Error - 9:56:01 AM] ** (FunctionClauseError) no function clause matching in XPExpert.ActiveProjects.active?/1
    (xp_expert 0.1.0-728b76e) lib/expert/active_projects.ex:91: XPExpert.ActiveProjects.active?(nil)
    (xp_expert 0.1.0-728b76e) lib/expert/state.ex:147: XPExpert.State.apply/2
    (xp_expert 0.1.0-728b76e) lib/expert.ex:403: XPExpert.apply_to_state/2
    (xp_expert 0.1.0-728b76e) lib/expert.ex:218: XPExpert.handle_notification/2
    (xp_gen_lsp 0.11.3) lib/gen_lsp.ex:600: anonymous fn/2 in XPGenLSP.handle_notification_sync/3
    (xp_telemetry 1.3.0) /home/runner/work/expert/expert/apps/expert/deps/telemetry/src/telemetry.erl:324: :xp_telemetry.span/3
    (xp_gen_lsp 0.11.3) lib/gen_lsp.ex:599: XPGenLSP.handle_notification_sync/3
    (xp_gen_lsp 0.11.3) lib/gen_lsp.ex:502: XPGenLSP.loop/3