Hi,
I am posting this to help other people that may have the same issue I had while uploading app to the store.
The situation is this:
I was uploading my app to the store ,to be more specific in the second step of registration.
I filled the form and uploaded the pictures,then I received a message of warning telling me that some symbols were not valid (Example: '/' '#' '\' ';').The problem is that I was not using any of these in the form I filled.
Then when I try to continue with registration, the page keeps loading and doesnt go through that step. Then I changed all the fields with different data , different description and tags, and the issue still happened.
I resolved it after noticing that the ScreenShots I was uploading had a symbol not allowed "#".
Hope to help other developers