VSQL in Unix- Locale Issue

Hi,
I am trying to connect to HP Vertica DB from AIX unix box, I am getting error message as follows 
"Invalid locale: run the "locale" command and check for warnings". When I issues the locale command I could see that locale is set to en_US.UTF-8

$ locale
LANG=en_US.UTF-8
LC_COLLATE="C"
LC_CTYPE="C"
LC_MONETARY="C"
LC_NUMERIC="C"
LC_TIME="C"
LC_MESSAGES="C"
LC_ALL=en_US.UTF-8

Can anyone help and advice whats wrong or do I need to do any other settings?