Getting an Error at launcher bootup

[Mesarthim]

Summer sales overloaded steam. Technically you can try to login with spamming the cogwheel until it shows something otherwise you'll have to wait it out.

It isn't a problem on your end.

Edit:

Spam the cogwheel in the upper right of the launcher, then hit the back arrow to go back to login. Repeat this process until you get the login field.