"Failed to start Apply Kernel Variables" during Boot

Since the last sudo zypper dup update I’ve been getting “Failed to start Apply Kernel Variables” messages during boot, where can I check them after logon please?

https://forums.opensuse.org/showthread.php/544714-Failed-to-start-apply-kernel-variables-on-Boot

Thanks, didn’t have the quotes in the /usr/lib/sysctl.d/50-default.conf file but the dracut -f part seems to have fixed it anyway, can you please let me know where/how to check boot errors?