Guys what could be the error with this form

you can add this in your form it solve the problem for me

<input type="hidden" name="_token" value="{!!   csrf_token() !!}" />

i dono exactly why its happen because it happen only with one form other r work fine

Form::open() generates a hidden field with the csrf token by default, no need to add it yourself.

Show us your routes.php file so we know what signin points to.

As says @Ruffles Form::open() should generate it, just check in generated HTML that it's done.

@ruffsaint Did you fix it?

@ruffsaint no error in your form code, it work in my pc. May problem with your mcrypt php extension, check it install and enable or not, if not install and enable

{!! Form::open(array('url' => 'signin', 'class' => 'form-signin')) !!}
{!! Form::text('email', null, array('required','class'=>'form-control', 'placeholder'=>'Your e-mail address', 'autofocus'=>'""')) !!}
{!! Form::password('password', array('required','class'=>'form-control', 'placeholder'=>'Your Password')) !!}
{!! Form::submit('Login!',array('class'=>'btn btn-lg btn-primary cent')) !!}
{!!Form::close()!!}