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Troubleshooting: Neural Engine Setup (Windows Only)

This section documents known issues we ran into and how they were resolved. If you hit a wall, scan here first — the fix is probably one we’ve already handled.

⁠

⚙️ R + RTools 42 Issues

🔴

gcc not found (system("gcc --version") returned 127)

Cause: RTools was installed but the C++ compiler (mingw64) was not downloaded via pacman.

Fix: Manually install toolchain using RTools Bash:

pacman -Sy --noconfirm

pacman -S --noconfirm mingw-w64-ucrt-x86_64-toolchain

✅ Then verify with:

Sys.setenv(PATH = paste(

"C:/rtools42/ucrt64/bin",

"C:/rtools42/usr/bin",

Sys.getenv("PATH"),

sep = ";"

))

system("gcc --version") # Should return version info

system("mingw32-make --version") # Should return GNU Make

🔴

RGui can’t find the RTools compiler

Cause: Wrong path environment or missing build tools

Fix: Ensure this is set every time before installing packages from source:

Sys.setenv(PATH = paste(

"C:/rtools42/ucrt64/bin",

"C:/rtools42/usr/bin",

Sys.getenv("PATH"),

sep = ";"

))

🧠 TensorFlow + Python Virtual Environment Issues

🔴

Keras model threw: “Only input tensors may be passed as positional arguments”

Cause: Legacy keras (v2) syntax used with keras3

Fix: Use correct keras3 syntax with layer_input():

library(keras3)

model <- keras_model_sequential(input_shape = c(10)) |>

layer_dense(units = 32, activation = "relu") |>

layer_dense(units = 1)

🔴

Python version not properly linked in R

Fix: Check Python path using:

library(reticulate)

py_config()

You should see:

python: C:/Users/YOU/Documents/.virtualenvs/r-tensorflow/Scripts/python.exe

If not, run:

tensorflow::install_tensorflow()

And restart R session.

🔌 Recharge API Issues

🔴

Object ‘res’ not found

Cause: You tried to inspect res outside of the function where it was defined.

Fix: Add print inside the function:

print(status_code(res))

🔴

Duplicate row.names when calling rbind()

Cause: Recharge returns unkeyed pages, so R sees duplicate row indices

Fix: Use dplyr::bind_rows() instead of do.call(rbind...):

return(dplyr::bind_rows(all_data))

✉️ Klaviyo API Issues

🔴

401 Unauthorized — Missing or Invalid Access Token

Cause: Wrong header format, missing Bearer or outdated API revision

Fix: Use correct header and revision format:

add_headers(

`Authorization` = "Klaviyo-API-Key YOUR_API_KEY",

`Accept` = "application/json",

`revision` = "2025-04-15"

)

🔴

Empty $data from profile endpoint even with 200 response

Cause: API accepted request but filter was malformed due to old revision or wrong encoding

Fix: Use updated format (2025-04-15) or check klaviyo for latest version and encode email correctly:

url <- "https://a.klaviyo.com/api/profiles"

queryString <- list(

filter = "equals(email,'example@example.com')"

)

response <- GET(

url,

query = queryString,

add_headers(

`Authorization` = paste("Klaviyo-API-Key", api_key),

`Accept` = "application/json",

`revision` = "2025-04-15"

)

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