Problems making it works in a new Joomla 1.07 (localhost)

Im reporting the following error when attempting to access, for example, to "Access Definition Manager" clicking "customer":

Fatal error: Cannot instantiate non-existent class: mosaccesslevels_jal in c:\appserv\www\prueba01\administrator\components\c om_jal_siteaccess\admin.jal_siteaccess.php on line 861

Joomla 1.07
Apache/1.3.33 (Win32) PHP/4.3.11

Help me please

I receive other error when clicking in "Set access rights for Users" and there changing the value of "Access" column:

Fatal error: Cannot instantiate non-existent class: mosuser_jal in c:\appserv\www\prueba01\administrator\components\c om_jal_siteaccess\jal_user_siteaccess.php on line 878

Dont know if this add some ligth to explain the problem.

[theprincy]

......any news?