Data.Binary.Get.runGet at position 57: demandInput: not enough bytes

[rvion]

While trying to understand, #31 (comment), I tried to stack build before stack ideand got this error message:

stack-ide: Data.Binary.Get.runGet at position 57: demandInput: not enough bytes

➜  test22 stack build
test22-0.1.0.0: configure
Configuring test22-0.1.0.0...
test22-0.1.0.0: build
Building test22-0.1.0.0...
Preprocessing library test22-0.1.0.0...
[1 of 2] Compiling Test             ( src/Test.hs, .stack-work/dist/x86_64-osx/Cabal-1.18.1.5/build/Test.o )
[2 of 2] Compiling Lib              ( src/Lib.hs, .stack-work/dist/x86_64-osx/Cabal-1.18.1.5/build/Lib.o )
In-place registering test22-0.1.0.0...
Preprocessing executable 'test22-exe' for test22-0.1.0.0...
[1 of 1] Compiling Main             ( app/Main.hs, .stack-work/dist/x86_64-osx/Cabal-1.18.1.5/build/test22-exe/test22-exe-tmp/Main.o )
Linking .stack-work/dist/x86_64-osx/Cabal-1.18.1.5/build/test22-exe/test22-exe ...
test22-0.1.0.0: install
Installing library in
/Users/RemiVion/dev/test22/.stack-work/install/x86_64-osx/lts-2.18/7.8.4/lib/x86_64-osx-ghc-7.8.4/test22-0.1.0.0
Installing executable(s) in
/Users/RemiVion/dev/test22/.stack-work/install/x86_64-osx/lts-2.18/7.8.4/bin
Registering test22-0.1.0.0...

➜  test22  stack ide
{"tag":"ResponseWelcome","contents":[0,1,0]}
stack-ide: Data.Binary.Get.runGet at position 57: demandInput: not enough bytes

[rvion]

on some other project:

➜  linklater git:(master) ✗ stack build
....

➜  linklater git:(master) ✗ stack ide
{"tag":"ResponseWelcome","contents":[0,1,0]}
{"tag":"ResponseUpdateSession","contents":{"progressOrigMsg":null,"progressStep":1,"progressNumSteps":2,"progressParsedMsg":"C\u0000o\u0000m\u0000p\u0000i\u0000l\u0000i\u0000n\u0000g\u0000 \u0000P\u0000a\u0000t"}}
{"tag":"ResponseUpdateSession","contents":{"progressOrigMsg":null,"progressStep":2,"progressNumSteps":2,"progressParsedMsg":"C\u0000o\u0000m\u0000p\u0000i\u0000l\u0000i\u0000n\u0000g\u0000 \u0000N\u0000e\u0000t\u0000w"}}
stack-ide: Data.Binary.Get.runGet at position 50: demandInput: not enough bytes

[lukexi]

Hi Rémi,
Oh yeah, I ran into that too! It happens when your ide-backend-server doesn't match the version that stack-ide was built against. Make sure that your stack binary directory (I think usually ~/.local/bin) is taking precedence over your cabal directory in your PATH, or just delete the old ide-backend* executables out of ~/.cabal/bin and you should be in business

[rvion]

My path was correctly setup, but indeed, I was using different snapshots (nightly for ide, lts2 for project)
Thanks ! :)

[mgsloan]

Cool, sounds like this is resolved? Feel free to reopen if it isn't.

I've created an ide-backend issue to improve the messages for this circumstance: fpco/ide-backend#292