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Cannot build app

1747688
4 days ago

Hello,

I’ve been trying to build a simple Connect IQ app for my Garmin Instinct 2X Solar Tactical, but I keep hitting the same error:

ERROR: Unable to load devices: null

No matter which device ID I use (instinct2x, instinct2x_tactical, even *_sim devices), the compiler always fails with the same message.

Here is what I have already tried:

  1. Java setup

    • Installed Eclipse Adoptium JDK 11 (C:\Program Files\Eclipse Adoptium\jdk-11.0.28.6-hotspot\bin\java.exe).

    • Confirmed with where java that this is the active Java.

  2. SDK versions

    • Installed SDK 8.2.3 (latest) → same error.

    • Installed SDK 7.3.1 (2024-09-23) → same error.

    • Made sure current-sdk.cfg points to the correct SDK folder.

  3. Devices

    • Used SDK Manager, selected 7.3.1 as active SDK, and installed device packages (Instinct 2X, All Devices).

    • Verified devices\instinct2x\... exists and devices.xml is present under the 7.3.1 SDK path.

    • Still, compiler always reports “Unable to load devices: null.”

  4. Tried multiple build commands (CLI)
    Example (with private key in DER format):

    "C:\Users\...\connectiq-sdk-win-7.3.1-...\bin\monkeyc.bat" ^ -f "monkey.jungle" ^ -o "bin\TestApp.prg" ^ -d instinct2x ^ -y "C:\Users\...\developer_key.der"

    → always fails with the same error.

  5. Tried inside Visual Studio Code with Connect IQ extension

    • Same result: the Monkey C Language Server crashes, and the output shows “Failed to load SDK supplementary files: null” or “Unable to load devices: null.”

    • (C:\Program Files\Eclipse Adoptium\jdk-11.0.28.6-hotspot\bin\java.exe -Xms1g -Dfile.encoding=UTF-8 -Dapple.awt.UIElement=true -jar c:\Users\xxx\AppData\Roaming\Garmin\ConnectIQ\Sdks\connectiq-sdk-win-7.3.1-2024-09-23-df7b5816a\bin\monkeybrains.jar -o bin\test.prg -f c:\Users\xxx\Desktop\garmin\test\monkey.jungle -y C:\Users\xxx\Documents\garmin\developer_key.der -d instinct2x_sim -w) 

  6. Other attempts

    • Tried with and without the -u devices.xml flag.

    • Verified key format (DER private key, also tested PEM).

    • Batch scripts to cycle through device IDs → all fail with the same “null” message.

At this point, it seems like the SDK can’t read its own device database, even though the files are physically present.

Has anyone else seen this? Is there a known issue with Instinct 2X device profiles in SDK 7.3.1 or 8.2.x? Should I be using a different device ID?

Any help would be appreciated — I’ve spent several days trying every combination, both CLI and Visual Studio Code.

Thanks in advance.