[Exim] failed to expand "${lookup{$local_part}lsearch{SYSTEM…

I'm just trying to cnfigure exim.I'm getting this error.
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# exim -bt dilipm
dilipm@??? cannot be resolved at this time:
    failed to expand "${lookup{$local_part}lsearch{SYSTEM_ALIASES_FILE}}":
failed to open SYSTEM_ALIASES_FILE for linear search: No such file or
directory
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The MX recored for out domain "s7technologies.com" is "s7technologies.com"
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#more /etc/exim/exim.conf
# primary_hostname =
domainlist local_domains = s7technologies.com
domainlist relay_to_domains =
hostlist   relay_from_hosts = 127.0.0.1
qualify_domain = s7technologies.com
[...]
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Created a local system uset 'dilipm'
# grep dilip /etc/passwd
dilipm:x:500:500::/home/dilipm:/bin/bash
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[root@exim-2 input]# more /etc/aliases
# Basic system aliases -- these MUST be present.
mailer-daemon:  postmaster
postmaster:     dilipm
[...]
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# exim -bt postmaster
postmaster@??? cannot be resolved at this time:
     failed to expand "${lookup{$local_part}lsearch{SYSTEM_ALIASES_FILE}}":
failed to open SYSTEM_ALIASES_FILE for linear search: No such file or
directory
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[root@exim-2 input]# ls -l /etc/aliases
-rw-r--r--    1 mailnull mail          654 Feb 25 13:00 /etc/aliases
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