additional info:
I tried accessing each pages, which UE created automatically, and find out "webassist/email/waue_contactform_1.php" shows the following error on the browser screen.
Fatal error: Call to undefined function waue_definition() in /home/pagodad1/public_html/chabuta.net/webassist/email/waue_contactform_1.php on line 15
looks like the system dosn't recognize "waue_definition" in the "waue_contactform_1.php", which was created by UE?