Validation is not functioning properly, it was working before

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Hello All,

I had developed my Addon, In which I have a few blocks, when we add block it opens a form which is being validated by validation helper below

$this->app->make('helper/validation/error');

It was working fine, but now it is opening a blank screen attached to this post, can anyone please guide me on urgent basis how can I debug this?

Also I have an anchor link in view.php with href as URL::to('', 'toggle_view', 'grid',base64_encode($currentUrl))
and I have a function in block controller.php named as "action_toggle_view", but it is not pointing to this method, It was also working fine before, don't know why now it looks disturbing.

Urgent guidance would be appreciated.

Thanks

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