Invalid partition table

I installed Gecko Tumbleweed along side an existing version of KaOS Linux. Now, when I boot i get an “Invalid Partiition Table” error. If I hit enter it boots into grub and boots normally. any ideas how to correct this?
Operating System: openSUSE Tumbleweed 20200806
KDE Plasma Version: 5.19.4
KDE Frameworks Version: 5.72.0
Qt Version: 5.15.0
Kernel Version: 5.7.9-1-default
OS Type: 64-bit
Processors: 4 × Intel® Core™ i5-3340M CPU @ 2.70GHz
Memory: 11.6 GiB of RAM
Graphics Processor: Mesa DRI Intel® HD Graphics 4000

What does “Gecko Tumbleweed” mean?
Which existing version of KaOS?
Is KaOS booting from the TW Grub menu?
Are both OS installed in same mode, MBR vs. UEFI?
Does Parted or Fdisk or Gdisk produce any error in list output?

Possibly there are different Grub versions disagreeing with each other, e.g. 2.02 in older KaOS and 2.04 in TW.

My first action would be to look at the partition table. So please show (as root)

fdisk -l

and/or

lsblk

BTW, I see this is your first post here: Welcome. And the following mught be of interest:
There is an important, but not easy to find feature on the forums.

Please in the future use CODE tags around copied/pasted computer text in a post. It is the # button in the tool bar of the post editor. When applicable copy/paste complete, that is including the prompt, the command, the output and the next prompt.

An example is here: Using CODE tags Around your paste.

Thank you for your replies.
Gecko tumbleweed is https://geckolinux.github.io/#download
I stumbled across a drop-down menu under Yast Bootloader. I changed it from GRUBEFI to GRUB2. That solved my problem. Thanks again.

Please in the future use CODE tags around copied/pasted computer text in a post. It is the # button in the tool bar of the post editor. When applicable copy/paste complete, that is including the prompt, the command, the output and the next prompt.

An example is here: Using CODE tags Around your paste.

Will do. Thank you for the information.

In the OpenSuse bootloader configuration I found a pull down menu with 2 options, GRUBEFI and GRUB2. It was set for GRUBEFI, I changed it to GRUB2 and my issue cleared itself up.