Default [Q] gapps not working with cm11

dear guys...
I rooted my mobile and installed nexus ROM firstly and xperia z2 ROM second....

after a lot of tomes swapping these ROMs, I found cm11 KitKat 4.4.4 version...

now I installed my mobile with this cm11 and gapps which they are mentioned in there web...

but after the first installation, the gapps error is frequently coming when I am going to open browser...

all Google apps are not working....
some says it is syncing problem and
some says enable download manager or
reset app preferences...

I tried all this but couldn't find any solution....

please guys solve this one....
I want this ROM at any cost....
I am waiting for your help....

Thank you very much....