How to stop "Unfortunately, Google Play Services has stopped" in Moto E?

Today I flashed *AOKP Marshmallow ROM* in my Moto E. After that I flashed *Nano GAPPS* from *OpenGapps*. Since then this message keeps popping up for about 2-3 minutes after I launch any Google Play related app. I have tried every conventional solution. I wiped cache and data of Google Play Store, Google Play Services and Google Play Framework, but to no avail. Just now I flashed another GAPP (pico). But still the problem is there. So what can I do to make it stop?