[Plugin: GWPG3] Undefined method error in version 0.85

I deleted the plugin and reinstalled it through the plugin page. When I activated the plugin I got the error.

Warning: include(wpg3_class_WPG3_Xhttp.php) [function.include]: failed to open stream: No such file or directory in /home/alter871/public_html/wp-content/plugins/wpg3/wpg3.php on line 640

Warning: include(wpg3_class_WPG3_Xhttp.php) [function.include]: failed to open stream: No such file or directory in /home/alter871/public_html/wp-content/plugins/wpg3/wpg3.php on line 640

Warning: include() [function.include]: Failed opening 'wpg3_class_WPG3_Xhttp.php' for inclusion (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home/alter871/public_html/wp-content/plugins/wpg3/wpg3.php on line 640

Fatal error: Class 'WPG3_Xhttp' not found in /home/alter871/public_html/wp-content/plugins/wpg3/wpg3.php on line 427

Please see here

I did that fix and it crashed the server. See my other forum message.

How you mean? What crashed your server? Where to look for?

How you mean? What crashed your server? Where you wrote about that?

I just installed the plugin on a new install of WP and G3 and as soon as I activate the plugin my site becomes unavailable with this error, Any suggestions or advice

Server error.

The website encountered an error while retrieving https://blog.mkblack.com/wp-admin/plugins.php. It may be down for maintenance or configured incorrectly.

Here are some suggestions:
Reload this web page later.
More information on this error

[sig moderated as per the Forum Rules]

The problem might be that you have to safe the page after inserting g3Url.
I experienced similar issues but they should be fixable with a Shift/Ctrl + r reload.