Perl Run-Time Error:

invalid year 2007 at /v/ext/web/adventcalendar/adventcalendar.cgi line 145.

Perl Run-Time Stack Backtrace:

package main file /v/ext/web/adventcalendar/adventcalendar.cgi line 145 

Perl Source-Code Excerpt:

143: }
144: die "invalid year $param_year" if ($param_year > 1900+$year or $param_year < 2000);
145: die "invalid year $param_year" if (not -f "adventcalendar.$param_year.html");
146: die "invalid door" if (defined $param_door and ($param_door > 24 or $param_door < 1));
147: 

Perl Run-Time Environment:

DOCUMENT_ROOT="/v/ext/web"
GATEWAY_INTERFACE="CGI/1.1"
HTTP_ACCEPT="Accept: application/xhtml+xml,text/html;q=0.9,text/plain;"
HTTP_ACCEPT_CHARSET="ISO-8859-1,utf-8;q=0.7,*;q=0.7"
HTTP_ACCEPT_ENCODING="gzip"
HTTP_ACCEPT_LANGUAGE="en-us,en;q=0.5"
HTTP_CACHE_CONTROL="no-cache"
HTTP_CONNECTION="close"
HTTP_HOST="www.openpkg.com"
HTTP_PRAGMA="no-cache"
HTTP_USER_AGENT="CCBot/1.0 (+http://www.commoncrawl.org/bot.html)"
PATH="/v/ext/sw/lib/openpkg/override:/v/ext/sw/bin:/v/ext/sw/sbin:/bin:/sbin:/usr/bin:/usr/sbin:/v/ext/sw/lib/openpkg/fallback"
QUERY_STRING=""
REDIRECT_SCRIPT_URI="http://www.openpkg.com/adventcalendar/"
REDIRECT_SCRIPT_URL="/adventcalendar/"
REDIRECT_STATUS="200"
REDIRECT_UNIQUE_ID="IVcykMJhmIIAAMd7Bs4AAAAQ"
REDIRECT_URL="/adventcalendar/"
REMOTE_ADDR="38.103.63.16"
REMOTE_PORT="53559"
REQUEST_METHOD="GET"
REQUEST_URI="/adventcalendar/"
SCRIPT_FILENAME="/v/ext/web/adventcalendar/adventcalendar.cgi"
SCRIPT_NAME="/adventcalendar/adventcalendar.cgi"
SCRIPT_URI="http://www.openpkg.com/adventcalendar/"
SCRIPT_URL="/adventcalendar/"
SERVER_ADDR="194.97.152.134"
SERVER_ADMIN="hostmaster@openpkg.com"
SERVER_NAME="www.openpkg.com"
SERVER_PORT="80"
SERVER_PROTOCOL="HTTP/1.1"
SERVER_SIGNATURE="<address>Apache/2.2.8 (OpenPKG/CURRENT) Server at www.openpkg.com Port 80</address>\n"
SERVER_SOFTWARE="Apache/2.2.8 (OpenPKG/CURRENT)"
UNIQUE_ID="IVcykMJhmIIAAMd7Bs4AAAAQ"