Why some apps are not working after rooting my galaxy s6102?

[RITIK]

my phone can go in recovery and download mode.so i hope it isnt bricked.can applying stock rom works?

 

[maktovic]

First unroot your phone and then flash stock ROM via Odin. It will bring everything back to normal.

Root exploits some bugs in stock ROM and sometimes these bugs are patched via official firmware upgrades, that's why app start crashing after rooting and sometimes don't even work.

I had to flash oldest stock firmaware I could find on samsung-upgrades.com to even get my phone rooted. Other comparatively newer firmwares didn't allowed to root the phone.