[solved] I'm having some trouble uploading plugins

1

Question / Problem

I'm building a JavaScript client with the Kintone plugin.
When I uploaded the plugin.zip file, I received an error message: "Error occurred."

  • Invalid request.

  • (CB_IL02 RzUEWHgWXNCp4pAsmQ89)

Current Situation

I tried with a different app or account or a different plugin.zip but the same result

When uploading from {domain}/k/admin/system/plugin/, the system calls two APIs: /k/api/blob/upload.json and it succeeds. The other API is k/api/dev/plugin/import.json with the response {
"code": "CB_IL02",
"messageType": "text",
"success": false,
"id": "RzUEWHgWXNCp4pAsmQ89",
"message": "Invalid request."
}

Code / Attempts

Just a file empty main.js or an my old plugin.zip that uploaded successfull

Error Message

Error occurred.

  • Invalid request.

  • (CB_IL02 RzUEWHgWXNCp4pAsmQ89)

Desired Outcome / Expected Behavior

I want to experiment with custom Kintone as soon as possible due to deadlines.

2

Would appear to be working properly again.

Successfully installed a plugin through the CLI.

:+1:

3

Hello @Doanh_Su_dai and @Jay_Lonnquist
It appears there was a system-wide issue, which was noted on the official notification page.

As there does not seem to be an English version available at this time, please allow me to summarize the issue:

When attempting to import a new plugin from the Kintone Administration page, an “Invalid Request” error would appear, preventing the plugin from being read/imported.

According to the notification, the issue occurred on Monday, May 18, 2026, approximately between 10:00 AM and 4:13 PM (JST). Based on this, I assume this is why the issue is no longer occurring and is now working as expected.

I hope this helps.