Google contact not sync

i want to sync my google account with my gmail but in my 4.3 sony xperia m device show me an error: sync is currently experiencing problems. it will be back shortly. its been days i have this issue also see this problem on my friend phone xperia sp 4.3 rest of syncing will work fine and i do this following:

1-clear contact app data and import with vcf.

2-remove google account and add again.

3-clear playService app data.

thank you.