Not working

Hello! It’s very interesting plugin but it’s not working. I installed it as described in readme.txt. When I execute it the following errors appear:

#/usr/local/nagios/libexec/check_cisco_config.pl -H 10.14.214.253 -C cvdnu7834nhu -I localhost -T running -L /usr/local/nagios/configs -l /usr/local/nagios/tftp -N c2960-2nd-floor

: command not foundibexec/check_cisco_config.pl: line 17:
/usr/local/nagios/libexec/check_cisco_config.pl: line 18: use: command not found
: command not foundibexec/check_cisco_config.pl: line 18:
/usr/local/nagios/libexec/check_cisco_config.pl: line 19: use: command not found
: command not foundibexec/check_cisco_config.pl: line 19:
/usr/local/nagios/libexec/check_cisco_config.pl: line 20: use: command not found
: command not foundibexec/check_cisco_config.pl: line 20:
/usr/local/nagios/libexec/check_cisco_config.pl: line 21: use: command not found
: command not foundibexec/check_cisco_config.pl: line 21:
: command not foundibexec/check_cisco_config.pl: line 22:
/usr/local/nagios/libexec/check_cisco_config.pl: line 24: =: command not found
: command not foundibexec/check_cisco_config.pl: line 24:
/usr/local/nagios/libexec/check_cisco_config.pl: line 25: =: command not found
: command not foundibexec/check_cisco_config.pl: line 25:
: command not foundibexec/check_cisco_config.pl: line 26:
/usr/local/nagios/libexec/check_cisco_config.pl: line 27: syntax error near unexpected token `;’
‘usr/local/nagios/libexec/check_cisco_config.pl: line 27: `check_arguments ();

Could somebody help me to fix this error??