Can't create content with a field_collection field type

Hi,
I need to create a content type (Content_Type_A) having a field_collection field type.
So, I installed an empty version of drupal (drupal-7.22) (without any module or any content type).
Then, I installed only two modules, which are FIELD COLLECTION & ENTITY (to be able to activate Field Collection module).
After that, I created a new content type formed by the title and a field collection (this field collection is formed only by a text field).
The problem is : When I tried to add a new content "having the type Content_Type_A", I can't do it.
When I cliced on the submit button, I have not get any error, in the same time, I don't have the new content added.
Note : I tried it in an empty new site, and it does not work.
So, if you have any suggestion, it will be very appreciated.
best regardes