BUG : Logging in with Facebook cause trouble

hii there
i recently tried log in via fb, i got error many times
even my friend who try to see the instructable experienced same trouble 
here is same link

i think that might not be problem with my tutorial 
some sync error 
i have uploaded a image , check that out

prinkas1 year ago
Even I experience same trouble many times whenever I try to login using facebook login link. Some tesla 12345 error occurs.
Thanks for letting us know. What browser and OS are you using?
rohit44524 (author)  mikeasaurus1 year ago
hey i just wanna know if bug is reported or not ?
Yes, it's been reported. Thanks!
rohit44524 (author)  mikeasaurus1 year ago
i m using windows 8 release preview but as told my friend have window 7 home basic ,
coming to browser tried all with opening facebook opened in one of tab of every browser

chrome : sometime do works n sometimes dont ,in case when i m not logged in n try to vote some one by clicking on vote n then following log in with facebook, it works but when i use top right cornered log in with fb it got me this error

Firefox mozila : when i click on log in with facebook on following vote without login ,there appear a small box of sync the account like where i allowed on first time.
and then disappear n page refresh without login n take to contest home page (contest info page)

internet explorer :
in this case everything happens as mozilla but page do not refresh

i know i have release preview but it (fb login button works for other website )
i hope i m not incorrect anywhere