ASM Configuration Assistant Create ASM error

Hi,
I have this error in Oracle when I want to create ASM instance using ASMCA and last time when I did this it worked just fine. Maybe I missed something this time but I can’t figure what. Any solution ? Please tell me what I did wrong.
Thank you !

Create ASM
Oracle Grid Infrastructure is not configured properly. ASMCA needs Oracle Grid infrastructure to configure ASM.
OK
