topic Re: This plugin could not be identified. Please contact your distributor. in Archicad C++ API

This plugin could not be identified. Please contact your distributor.

Vance99910 — Mon, 22 Dec 2025 01:19:21 GMT

I'm currently developing a custom add-on package, but after using it, the add-on displays an exclamation mark and is unusable. This applies to versions 26 and 28. How can I fix this to make it work? I've included the developer ID information in the add-on package.

26 : 4019 TAI FULL
28 : 28.2.2(5200)TAI FULL

Re: This plugin could not be identified. Please contact your distributor.

BerndSchwarzenbacher — Tue, 06 Jan 2026 17:25:28 GMT

Hi Vance,

There can be a lot of different reasons.

- Are you using Window or macOS?
- What SDK versions do you use?

- What's your build process?

Best regards,
Bernd

Re: This plugin could not be identified. Please contact your distributor.

Akos Somorjai — Fri, 09 Jan 2026 11:18:17 GMT

Hi Vance,

Some other ideas:

- Do you use any external libraries (DLLs/dylibs/frameworks))? Are they accessible to Archicad when the add-on is being loaded?

- Please also check with a resource editor if the MDID resource is in you add-ons binary and it contains non-dummy values.

Best,

Akos

Re: This plugin could not be identified. Please contact your distributor.

vtomaz — Wed, 22 Apr 2026 05:11:26 GMT

hello.

are there any clear instructions on how to write the code or where to insert the developer and addon information so that the addon will work (would be validated)?

Re: This plugin could not be identified. Please contact your distributor.

Tamas Polyak — Wed, 22 Apr 2026 11:27:18 GMT

Hi,

You can find all information on the Archicad 29 C++ API: Archicad 29 C++ API development site.

Redards,

Tamás

Re: This plugin could not be identified. Please contact your distributor.

vtomaz — Wed, 22 Apr 2026 14:54:48 GMT

Done all that, still not working. All samples dont have IDs inside and are only for DEMO use.

Re: This plugin could not be identified. Please contact your distributor.

Tamas Polyak — Thu, 23 Apr 2026 12:27:33 GMT

Hi,

Samples only work in Demo mode, but you can use your own developer id, and create or reuse a local id to load it in full mode.

If you're using the Examples API Development Kit, then change the MDID resource in <AddOnName>Fix.grc in the RFIX folder, or if you're using the cmake tools, in the RFIX/AddOnFix.grc resource.

Regards,

Tamás