Greeting all:
I just installed the b2commerce plugin into my blog but when I try to "install New" from the Plugins install page I get the following error from the b2commerce plugins:

Warning: require_once(/home2/gtwth/public_html/cvc505/inc/_misc/_upgrade.funcs.php) [function.require-once]: failed to open stream: No such file or directory in /home2/gtwth/public_html/cvc505/plugins/b2commerce_plugin/_b2commerce.plugin.php on line 14

Fatal error: require_once() [function.require]: Failed opening required '/home2/gtwth/public_html/cvc505/inc/_misc/_upgrade.funcs.php' (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home2/gtwth/public_html/cvc505/plugins/b2commerce_plugin/_b2commerce.plugin.php on line 14

Line 14 says

require_once($GLOBALS['inc_path'].'_misc/_upgrade.funcs.php');

I am currently running B2evolution version 2.4.5 and the version of the b2commerce I am trying to install is .01

I beleive my web site is running PHP 5 also.

Any suggestions as to how to fix this would be greatly appreciated.