Why do I get the error: post-commit hook failed (exit code 255) with no output.

I am getting the following error when I commit to a repository:

post-commit hook failed (exit code 255) with no output.

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The post commit code is as follows:

@echo off

setlocal enableextensions

set REPOS=%1
set REV=%2
set TEMPFILE=C:\TEMP\%REV%.txt
set LOGFILE=D:\svn\logs\mysite\post_commit.log

set MANTIS_PATH="D:\home\mantis"

"C:\Program Files\SlikSvn\bin\svnlook" author %REPOS% -r %REV% >> %TEMPFILE% 2>>C:\TEMP\err.txt
"C:\Program Files\SlikSvn\bin\svnlook" date %REPOS% -r %REV% >> %TEMPFILE% 2>>C:\TEMP\err.txt
"C:\Program Files\SlikSvn\bin\svnlook" changed %REPOS% -r %REV% >> %TEMPFILE% 2>>C:\TEMP\err.txt
echo revision:[%REV%] >> %TEMPFILE% 2>>C:\TEMP\err.txt
"C:\Program Files\SlikSvn\bin\svnlook" log %REPOS% -r %REV% >> %TEMPFILE% 2>>C:\TEMP\err.txt

date /T >> %LOGFILE% 2>>C:\TEMP\err.txt
time /T >> %LOGFILE% 2>>C:\TEMP\err.txt
D:\wamp\bin\php\php5.3.0\php.exe %MANTIS_PATH%\scripts\checkin.php < %TEMPFILE% >> %LOGFILE% 2>>C:\TEMP\err.txt

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- As you can see there is extensive error logging, but the error log never gets populated
- Both dev and live environments are Windows
- The line that seems to case the error is the final one - where PHP is called. When I take this out the commit works without issue

As you've probably made out, this is hooking up my SVN checkins with Mantis bug tracker. The interesting thing is that the PHP script is being executed, i.e. the notes are being added to bugs and the auto-closing of issues is working. It just seems to erroring for some reason. Mantis' checkin.php looks like this (some general comments removed for readability):

#!/usr/bin/php -q
<?php

global $g_bypass_headers;
$g_bypass_headers = 1;
require_once( dirname( dirname( __FILE__ ) ) . DIRECTORY_SEPARATOR . 'core.php' );

# Make sure this script doesn't run via the webserver
if( php_sapi_name() != 'cli' ) {
	echo "checkin.php is not allowed to run through the webserver.\n";
	exit( 1 );
}

# Check that the username is set and exists
$t_username = config_get( 'source_control_account' );
if( is_blank( $t_username ) || ( user_get_id_by_name( $t_username ) === false ) ) {
	echo "Invalid source control account ('$t_username').\n";
	exit( 1 );
}

if( !defined( "STDIN" ) ) {
	define( "STDIN", fopen( 'php://stdin', 'r' ) );
}

# Detect references to issues + concat all lines to have the comment log.
$t_commit_regexp = config_get( 'source_control_regexp' );
$t_commit_fixed_regexp = config_get( 'source_control_fixed_regexp' );

$t_comment = '';
$t_issues = array();
$t_fixed_issues = array();
while(( $t_line = fgets( STDIN, 1024 ) ) ) {
	$t_comment .= $t_line;
	if( preg_match_all( $t_commit_regexp, $t_line, $t_matches ) ) {
		$t_count = count( $t_matches[0] );
		for( $i = 0;$i < $t_count;++$i ) {
			$t_issues[] = $t_matches[1][$i];
		}
	}

	if( preg_match_all( $t_commit_fixed_regexp, $t_line, $t_matches ) ) {
		$t_count = count( $t_matches[0] );
		for( $i = 0;$i < $t_count;++$i ) {
			$t_fixed_issues[] = $t_matches[1][$i];
		}
	}
}

# If no issues found, then no work to do.
if(( count( $t_issues ) == 0 ) && ( count( $t_fixed_issues ) == 0 ) ) {
	echo "Comment does not reference any issues.\n";
	exit( 0 );
}

# Login as source control user
if( !auth_attempt_script_login( $t_username ) ) {
	echo "Unable to login\n";
	exit( 1 );
}

# history parameters are reserved for future use.
$t_history_old_value = '';
$t_history_new_value = '';

# add note to each bug only once
$t_issues = array_unique( $t_issues );
$t_fixed_issues = array_unique( $t_fixed_issues );

# Call the custom function to register the checkin on each issue.

foreach( $t_issues as $t_issue_id ) {
	if( !in_array( $t_issue_id, $t_fixed_issues ) ) {
		helper_call_custom_function( 'checkin', array( $t_issue_id, $t_comment, $t_history_old_value, $t_history_new_value, false ) );
	}
}

foreach( $t_fixed_issues as $t_issue_id ) {
	helper_call_custom_function( 'checkin', array( $t_issue_id, $t_comment, $t_history_old_value, $t_history_new_value, true ) );
}

exit( 0 );

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