Its related to uncatched javascript exception on your site.

Purusothaman , thanks for replying , but i don't understand what should i do
paul , thank you to , i updated the plugin "anti spammer" , and that's it !!

i havn't did anything else

It might be due to some custom java scripts that you could have used..

Do u get this error often? Try to disable some plugins and see,,

i always get it , i disabled some plugins and it didin't work ! :S

Waad, do you use Attracta?

No !

i will pay for a developer to check my site if it's possible !

When I last had this, it was from a .fastinclude file in the www folder of my site placed by Attracta. It can also be from a external Javascript, try finding one, and removing. It should be something that may have a form, since it is interfering with your login. 

Guys, can you please educate this dump by explaining what is Attracta? Google said me that its something related to SEO.

Attracta is a company providing search engine visibility services (https://www.attracta.com/aboutus.jsp)

Thanks for the info.

Does it just say "Parser Error" or is there more information on the line. It could be a PHP parser error which may come form you looking at code in an editor. Please advise.

Should be related to javascript error.

The problem seams to be from the plugin not uninstall propily 

I  can not even get to admin plugin page 

Tammy I can't enter your website. All I get is just a blank page. Can someone with this error, share your URL, please?

yeah riss i am trying ftp a back up now because everything crashed

what happened ross was on uninstall plugin it got hung up  and from there it just got worse untill everything crashed
before it all crashed i could get to some admin pages and every time it say settings updated 

Are you referring to this plugin: Attracta?

no was video uploader plugin that caused me the problem 
fist sign of trouble after try uninstall is was parser error on try login to site  then i noticed i could not get to some admin pages but the site was still running 
the more admin pages i tryed to get to the worse it got untill
no admin pages opened and not long after that lost everything