I get this message over and over again every time I try to start my Onigiri.
I didn't played for a while and I guess there are many updates to make.

The launcher shows me how it load about to 80% and then the message appears not allowing me to continue.
I already tried to reinstall the game already too. The same thing keeps happening.

I don't really know what to do about this, please help?

Usually you can restart the game by closing it and opening it again. However, if the update did not install properly, you may have to uninstall and reinstall the game again.
Please see our guide here on how to remove all of the files properly.