Formeditor not running in Developer 8.0.0. b3

[stefanoni]

After import the 7.x-Solution into 8.0.0. b3 ,
and try to Open a Form in Editor (CTRL-A),
it get at position in the developer, were it should be the formeditor, this :

HTTP Status 404 - /rfb/angular/index.html

Screen Shot 07-29-15 at 01.04 PM.JPG (405.12 KiB) Viewed 3049 times

Thank you for any help.

[stefanoni]

OK, I found the Issue.
The Developer was on a used Port.

I Changed it in ....pathToDeveloper\application_server\server\conf\server.xml