[Q] Can't install anything from playstore anymore topic

Hello fellow OmniROM useres, I am using Omnirom on my international SGS4, always latest nightly.
But since yesterday I have this weird error message whenever I try to install an app over PlayStore

iDOTimgurDOTcom/a4BL4QZDOTpng

even though I have more than enough free space, as you can see here:

iDOTimgurDOTcom/AVXjoi1DOTpng

I've alyready tried everything I could find on this error message but it still won't install anything.
Looking forward to a hopefully quick solution, many thanks in advance

(links in that weird format because forum won't let me post them)