Adding support for new device. LuCi says image does not contain supported format

I am working on a ramips target and I built the image. I booted the device using tftp and device works fine through initramfs loaded through tftp. When I went ahead to flash the sysupgrade image, I get following error on LuCI web interface:
The uploaded image file does not contain a supported format. Make sure that you choose the generic image format for your platform.

How should I debug this problem?

Try to upgrade from shell with sysupgrade and post the more verbose output of the failure here.

How does your device image definition look like?
Especially the sysupgrade part...

I guess it was something to do with the way partitions were defined. It worked and device booted.

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