What does あなたでは mean in this sentence?


I was studying the grammar for かもしれない and I found the following example:

> あなた **では** 間に合わないかもしれない。

The translation given for this sentence is...

> "You might not get there in time."

And then I got confused 'cause I thought that the meaning was:

> "He might not be with you on time"

why? Because of the で particle since it could also mean "with" (with you, with
him, etc.) But maybe the person who wrote this put that で by mistake.  
Because I can't understand what で does in this sentence.  
Please help me




Considering just the bare sentence and your given translation, I would think
of something like:

> あなたでは間に合わないかもしれない。 You might not get there in time "by yourself".

