Problem in pgsql

Dear sir,

I am encountering these errors

-bash-2.05b$ createuser -U postgres -d -A -P dspace
Enter password for new role:
Enter it again:
Shall the new role be allowed to create more new
roles? (y/n) n
createuser: relocation error: /usr/lib/libpq.so.4:
undefined symbol: krb5_cc_get_principal
-bash-2.05b$ createuser -U postgres -d -A -P dspace
Enter password for new role:
Enter it again:
Shall the new role be allowed to create more new
roles? (y/n) y
createuser: relocation error: /usr/lib/libpq.so.4:
undefined symbol: krb5_cc_get_principal
-bash-2.05b$ createdb -U dspace -E UNICODE dspace
createdb: relocation error: /usr/lib/libpq.so.4:
undefined symbol: krb5_cc_get_principal
-bash-2.05b$

I am using Redhat 3 enterprise linux..

installed Pgresql ver.

[root(at)localhost root]# rpm -qa |grep sql
postgresql-server-8.1.4-1PGDG
postgresql-jdbc-8.1.4-1PGDG
postgresql-8.1.4-1PGDG
postgresql-contrib-8.1.4-1PGDG
postgresql-docs-8.1.4-1PGDG
postgresql-python-8.1.4-1PGDG
postgresql-test-8.1.4-1PGDG
postgresql-libs-8.1.4-1PGDG
postgresql-devel-8.1.4-1PGDG
postgresql-pl-8.1.4-1PGDG
[root(at)localhost root]#

Kindly give me the solution as soon as possible

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