Failed to create a database with ASM

I had the following issue :

SQL> @crebase
CREATE DATABASE JJO
*
ERROR at line 1:
ORA-01501: CREATE DATABASE failed
ORA-00200: control file could not be created
ORA-00202: control file: '+DATA'
ORA-17502: ksfdcre:4 Failed to create file +DATA
ORA-15001: diskgroup "DATA" does not exist or is not mounted
ORA-15055: unable to connect to ASM instance
ORA-01031: insufficient privileges