"An error occurred while synchronizing metadata." on VS Code MacOS 26 Aarch64

[bencer3283]

Just upgraded to the latest version of STM32Cube for VS Code extension (3.6.4) and now the extension stopped to work. I've tried reinstalling the extension pack several times. Every time after the bundle was installed an error show up saying "An error occurred while synchronizing metadata. Please try run "STM32Cube: Install prerequisite bundle" and "STM32Cube: Synchronize pack list". Or work offline."
Running "STM32Cube: Install prerequisite bundle" from the VS Code command palette will result in a message saying "No STM32Cube bundle to install", subsequently running "STM32Cube: Synchronize pack list" will return the original metadata synchronization error.

I checked my HOME/Library/"Application Support"/stmcube/ directory, the bundle/ folder seems to contain what I expected, things like cmake, gnu-gdb-for-stm32 or the stink-gdbserver, etc. However, the packs/ folder is empty, not sure if that's the problem. 

I checked the output log of STM32Cube Core and found the following:

```

[Info] 'cube pack sync' exited with signal null [1]

[Error] Failed to synchronize PDSC metadata: Syncing metadata information /Users/poshengcheng/Library/Application Support/stm32cube/packs

Snapshot is already up to date

Syncing online metadata information /Users/poshengcheng/Library/Application Support/stm32cube/packs

Checking pidx https://developer.st.com/st-pack-server/api/v1/pidx/STMicroelectronics.pidx... (1/1)

Error during metadata sync: Error: Unexpected close tag

Line: 4

Column: 117

Char: >

```

Additionally, after I selected a MCU device in "Setup STM32Cube Project(s)", downloading the supporting packs for the specified device always fails. The following message is from the output log of STM32Cube CMake Build:
```

2025-10-17 22:58:45.028 [Info] Pack STMicroelectronics.stm32l4xx_dfp.1.1.0 (1/1)

2025-10-17 22:58:45.028 [Info] Downloading https://developer.st.com/st-pack-server/api/v1/pack/STMicroelectronics.stm32l4xx_dfp.1.1.0.pack... (1/1)

2025-10-17 22:58:48.060 [Info] Unable to install pack STMicroelectronics.stm32l4xx_dfp.1.1.0

2025-10-17 22:58:48.061 [Info] Error during installation: Error: Could not fetch content of pack-URL: https://developer.st.com/st-pack-server/api/v1/pack/STMicroelectronics.stm32l4xx_dfp.1.1.0.pack, got: 503 - Service Unavailable

2025-10-17 22:58:48.069 [Info] 'cube pack install STMicroelectronics.stm32l4xx_dfp.1.1.0' exited with signal null [1]

2025-10-17 22:58:48.071 [Error] Failed to download pack 'STMicroelectronics.stm32l4xx_dfp.1.1.0'. Please check your setup and try again (via command line 'cube pack install <pack_id>' or via command palette 'STM32Cube: Restore STM32Cube CMake projects configuration')

```

So far I've only been able to build the project but attempts to debug have failed since the stm32cube doesn't seem to be able to setup the project with the selected device. 

[Peter3718]

it's back to be working, thanks.

peter

[JSchn.4]

The error message is gone!

[bencer3283]

can confirm it is back to working. really appreciate the work done by the ST team!

[ddpf]

What was the problem?

[Julien D]

For obvious reason I can't enter much into details, but be assured that involved teams will take the appropriate actions to prevent resurfacing of this issue.

In addition the faced error message has been flagged "unclear", to say the less, and next versions will be more explicit if such network issue reappears...

Error during metadata sync: Error: Unexpected close tag
Line: 4
Column: 117
Char: >