configuration tool - "Upload old configuration" json not working

honpo

Trying to change feature of custom built printer. Uploaded an old config json and got a popup:
"No valid configuration from previous session found. Looks like you have uploaded a plain configuration.h and not a version generated with the configuration tool."

Check my json file and found nothing suspicious. So I download a new json from:
https://www.repetier.com/firmware/v092/
and upload that new json immediately but still got the same popup. Backend problem?

***
Oh! I just upload the Configuration.h now and no popup. Hope it's working.

Repetier

Thanks for the hint. Have fixed it. Normally I always use the configuration.h as this contains both in one file so I missed this misfunction.