When you attempt to Launch Graphical Analysis version 4 on Windows, you may get an error message that says:


A JavaScript error occurred in the main process

Uncaught Exception:
Error: The specified module could not be found.
\\?\C:\Program Files (x86)\Vernier Graphical Analysis\resources\app\resources\vstGrpcNodeModule.node
at Error (native)
at process.module.(anonymous function) [as dlopen] (ELECTRON_ASAR.js:178:20)
at Object.Module._extensions..node (module.js:583:18)
at Object.module.(anonymous function) [as .node] (ELECTRON_ASAR.js:178:20)
at Module.load (module.js:473:32)
at tryModuleLoad (module.js:432:12)
at Function.Module._load (module.js:424:3)
at Module.require (module.js:483:17)
at require (internal/module.js:20:19)
at Object. (C:\Program Files (x86)\Vernier Graphical Analysis\resources\app\resources\grpc_server.js:1:93)

This is caused by a missing or corrupt Microsoft Visual C++ redistributable.
1) Go into Add/Remove Programs and check to see if you have “Microsoft Visual C++ 201? Redistributable (x86) 14.?????” (The year will be either 2015 or 2017 depending on 14.0 or 14.1.)
2) If you do have it, remove it, (make sure you don’t remove the x64 version by mistake.)
3) Reboot your computer.
4) Then reinstall it. The file is here: vc_redist.x86.exe

See also:
Why is Logger Pro/Logger Lite giving an error about mfc140u.dll or 0xc000007b?