Error in Thread module

[kathiste]

In Thread module I get an error because $log variable is not defined in DetailView.ohp (and some more files)
I try to update the code adding this line

/*line added*/
global $log;
...
$log->info("Thread DetailView");

and I can do something.
Then I get another error when trying to display the list

THREAD LIST
mytread kathiste : 21/02/2008 12:48

content of a thread
Notice: Undefined index: type in D:\gw\ApacheSoftwareFoundation\Apache\htdocs\sugar \data\SugarBean.php on line 2881
Notice: Undefined index: type in D:\gw\ApacheSoftwareFoundation\Apache\htdocs\sugar \data\SugarBean.php on line 2885
Notice: Undefined index: type in D:\gw\ApacheSoftwareFoundation\Apache\htdocs\sugar \data\SugarBean.php on line 2881
Notice: Undefined index: type in D:\gw\ApacheSoftwareFoundation\Apache\htdocs\sugar \data\SugarBean.php on line 2885
Notice: Undefined index: type in D:\gw\ApacheSoftwareFoundation\Apache\htdocs\sugar \data\SugarBean.php on line 2881
Notice: Undefined index: type in D:\gw\ApacheSoftwareFoundation\Apache\htdocs\sugar \data\SugarBean.php on line 2885

Post List
Select Start Previous (0 - 0 of 0) Next End
Title Sort Parent Thread Created By Sort Modified By Sort Date Modified Sort
Select Start Previous (0 - 0 of 0) Next End

And more, the button REPLY TO POST shows the code

<? echo $mod_strings['LBL_REPLY_TO_POST']; ?>

not the correct label