I notice that any class not found in eclipse after **`ctrl`+`shift`+`t`** push.

I notice that I cannot see files, that expose so:

![enter image description here](https://i.stack.imgur.com/RNo8g.png)

And following classes find good:

![enter image description here](https://i.stack.imgur.com/hR6Pl.png)

How to mark file as source code file in Eclipse?