Check getting excel file (eguide-xxxxx.xml) is collect.
You can see that file by web browser.
1. Is enable "mbstring" extension?
2. Is it setup something?
check detail setup, put "info.php" on your site like following and view it.
<?php
phpinfo();
see section "mbstring"
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Nobuhiro YASUTOMI (MySite Users Webmaster)
Nobuhiro YASUTOMI (MySite Users Webmaster)