I envy your first world problems, guys (like the low colonization range, the scarcity of CMMs, non-selectable first station position, etc. etc.).

Poor plebeian me cannot even seem to claim a system.
The system is uninhabited, colonizable, unclaimed, it's within range, the UI allows me to click the "Configure Primary Port" button, I can select station type and layout, I can push the "Conform Claim 25000000 Cr" button, but after a couple of seconds of "Processing Request, Please Wait" notification it always ends up with the following stupid error message saying "System Claim U":
It has happened like 50 times now...