13 micropost error

I need to solve this problem

What is the first step to solve this problen?

1.if you don't understand what is the problem

In this situation is "Argument error "

What is the argument error ?

Which is you see that is argument is not exist =nil or empty

And then you need to confirm database at the first time

1.confirm your log folder of development

2.you need to look up in the rails console whether really argument

Is exist or not

Above is really it is (home.html.erb )file