Question forum not appear in my front end site

Hallo there !

i have installed kunena on my joomla site . And the installation was successfull ..no error occured in my back end site . Then i have made a menu and linked it to kunena . I named this menu forum on my site www.lamanarab.com

when i click on forum menu .. the forum didn`t display . It have ask my hoster and they send me this message ;

Following is the error messages found on the server's end:

PHP Notice: Undefined variable: boardclass in C:\Domains\lamanara\lamanarab.com\wwwroot\components\com_kunena\template\default\plugin\profilebox\profilebox.php on line 175
PHP Notice: Undefined variable: boardclass in C:\Domains\lamanara\lamanarab.com\wwwroot\components\com_kunena\template\default\latestx.php on line 82
PHP Notice: Undefined variable: boardclass in C:\Domains\lamanara\lamanarab.com\wwwroot\components\com_kunena\template\default\latestx.php on line 83
PHP Notice: Undefined variable: boardclass in C:\Domains\lamanara\lamanarab.com\wwwroot\components\com_kunena\template\default\latestx.php on line 84
PHP Notice: Undefined variable: boardclass in C:\Domains\lamanara\lamanarab.com\wwwroot\components\com_kunena\template\default\latestx.php on line 85
PHP Notice: Undefined variable: boardclass in C:\Domains\lamanara\lamanarab.com\wwwroot\components\com_kunena\template\default\latestx.php on line 86
PHP Notice: Undefined variable: boardclass in C:\Domains\lamanara\lamanarab.com\wwwroot\components\com_kunena\template\default\latestx.php on line 119
PHP Notice: Undefined variable: boardclass in C:\Domains\lamanara\lamanarab.com\wwwroot\components\com_kunena\template\default\latestx.php on line 121
PHP Notice: Undefined variable: boardclass in C:\Domains\lamanara\lamanarab.com\wwwroot\components\com_kunena\template\default\latestx.php on line 124
PHP Notice: Undefined variable: boardclass in C:\Domains\lamanara\lamanarab.com\wwwroot\components\com_kunena\template\default\latestx.php on line 127
PHP Notice: Undefined variable: boardclass in C:\Domains\lamanara\lamanarab.com\wwwroot\components\com_kunena\template\default\latestx.php on line 130
PHP Notice: Undefined variable: boardclass in C:\Domains\lamanara\lamanarab.com\wwwroot\components\com_kunena\template\default\latestx.php on line 166
PHP Notice: Undefined variable: boardclass in C:\Domains\lamanara\lamanarab.com\wwwroot\components\com_kunena\template\default\latestx.php on line 226
PHP Notice: Undefined variable: boardclass in C:\Domains\lamanara\lamanarab.com\wwwroot\components\com_kunena\template\default\latestx.php on line 227
PHP Notice: Undefined variable: boardclass in C:\Domains\lamanara\lamanarab.com\wwwroot\components\com_kunena\template\default\latestx.php on line 228
PHP Notice: Undefined variable: boardclass in C:\Domains\lamanara\lamanarab.com\wwwroot\components\com_kunena\template\default\latestx.php on line 229
PHP Notice: Undefined variable: boardclass in C:\Domains\lamanara\lamanarab.com\wwwroot\components\com_kunena\template\default\latestx.php on line 230

can someone tell me how to solve this problem .. thanks

Which template are you using? Please test, if the problem persists with template default_ex.

template for my site ? or template for kunena forum ?

Kunena Forum. Joomla Backend -> Components -> Kunena Forum -> Kunena Configuration -> Frontend

ok i have test with all template .. default_grey , default_ex but the same error display

www.lamanarab.com/index.php?option=com_kunena&Itemid=37

thanks

ok .. the problem has solved .

i change image_sets from default to default_ex .

but why i cannot use default ? just a question ..