Why I can't create an issue collector?

[Hala Haggag]

when I try to create an issue collector for specific project by hitting Submit I'm getting neither an error message nor being redirect to the issue Collectors list view page. The page only refresh when hitting the Submit button without creating any issue collector.

and I'm already have the "Allow unassigned issues"  ON 

What should I do now so I can create an issue collector??