[Plugin: Visitor Maps and Who’s Online] strange sh error at startup of this plugin

Tell me about your server.
Linux or Windows?
What version of PHP?
Do you have PHP safe_mode enabled? if so, turn it off.

It’s a Linux server and PHP 5.2.5, no safe_mode
do you want the phpinfo() output?

OK, I would look at phpinfo()

Send me the link at my site:
https://www.642weather.com/weather/contact_us.php

I have sent a mail to you right now with the URL. Thanks

I cannot tell by the phpinfo what the problem might be.
Does your wordpres have debugging enabled?

inside wp-config.php
define('WP_DEBUG', true);

If it was already enabled you might want to disable it. That might fix the problem.
If it is not enabled, add it temporarily for testing, it might reveal a problem.