Getting Weird Issue with spawning props!

Basically whenever I use FPP on my DarkRP server it prevents me from spawning props, but when I remove FPP it lets me spawn props with no restrictions, with FPP it lets me only spawn ragdolls and gibs no erros show nothing, it would be amazing if someone could help me

EDIT

only the default ULX groups can spawn props (all except user)

So if it says its a blocked model you probably have the whitelist is a blacklist ticked.

No error shows, when you go to spawn it it does nothing, no erros popups nothing

[editline]11th November 2017[/editline]

edited the post, only the default ULX ranks excluding user (superadmin, admin, operator) can only spawn props, how do I change it so all ranks are allowed to spawn props?