With errors like this:
ErrorException (E_UNKNOWN) Trying to get property of non-object (View: /to/path/assign_template.blade.php)
How do I figure out line number where error is being produced?
In Laravel 4, on the left side you can click back down through the stack trace. Usually in views, 3-4 calls down will be the actual error that occurred in your view file.
That error is caused by trying to access the property of something that isn't an object, usually I find this is when trying to access relations to a model. Something like $model->relation->attribute. $model->relation in that case is usually null.