I just updated RankMath and directly after activating RankMath again, error2 showed up and it stays even after reloading and re-log-in. If WP loads pages you see error1 (which is error 2 in full view, I guess).
Thank you for contacting Rank Math and sorry for any inconvenience that might have been caused due to that.
These warnings are false positives because of the usage of the php_uname() function. You can, however, turn off Usage tracking in the plugin to prevent them by heading over to Rank Math > General Settings > Others as shown below:
As I marked it as solved already, the problem vanished after de-activating the plug-in and re-activating it…but by the way, the folder ‘others’ you mentioned I do not have; I got the update installed already.