Undefined variable & Trying to get property of non-object errors

[vizion2000]

 

I am very new to php  :-[and am trying to run a php program on freebsd 6.1 version php5-5.2.1_3, apache-2.2.4_2

 

I am getting multiple errors, reported in httpd-error.log similar to the one shown below and have no idea how to begin tracing the problems. Some of the following facts may/may not be relevant: :-\

 

1. The code is being run successfully by others but  I have not, so far, found anyone running it on the same version of php.

2. The code is from groupjivefb http://www.shaeleighland.com/ downloads area groupjivefb.zip which is a modification of the groupjive compoment for joomla. I have reported the problem but it is only a small group of people. So far no one has been able to replicate the difficulty.

3. Could the error gave something to do with the version of  php I am running? I have no means of testing for that.

4. I have no idea how to set up an environment to test/trace php code for debugging purposes.

 

 

I appreciate I am asking a lot but if anyone could be kind enough to help or point me in the right direction it would be much appreciated.:

 

Here is one example:

 

Notice: Undefined variable: row in /usr2/virtualwebs/methuselaproject.org/components/com_groupjivefb/groupjivefb.html.php on line 67

 

Notice: Trying to get property of non-object in /usr2/virtualwebs/methuselaproject.org/components/com_groupjivefb/groupjivefb.html.php on line 67

 

The following lines appear in the source code around line 67 within  a declaration of "function newgroup" in  "class HTML_wg":

 

$tmpl->addvar( 'newgroup', 'GJ_MESSAGE', $message );

$tmpl->addvar( 'newgroup', 'GJ_GROUPNAME', $gj_groupname );

# the next line is line 67

$tmpl->addvar( 'newgroup', 'GJ_DESCR', $row->descr );

 

Thanks in advance for getting me started on tracing the problem

 

david