So I'm running AOKP M5 and about 1/8 apps I try to download I get an error code. Not sure if this has to do with AOKP but I'll add a pic. Hoping someone knows how to fix it.
I was also having this problem on M5. I'm not sure how to fix it, but you can still purchase apps from the Play Store via the web browser, which is what I did. I didn't mind that workaround since I don't often times download new apps, let alone paid ones.
I tried using my browser to start a install with no luck. It said that it was starting and nothing on my phone happened. Maybe I missed a step? Tried it a few times now with no luck