Subdomain Problems

Hi,
I don´t know why but every subdomain i´m creating its receiving a Internal Server Error message.

I have subdomains working and subdomains not working.
I´ve checked config on httpd.conf and on DNS zone and it is the same config, but dont work.

Anyone have an idea ? what can I do?

 

I found this on my error_log:

[Fri Jul 1 18:13:07 2005] [alert] [client myIP] /home/dsdd/public_html/sera/.htaccess: Invalid command '$', perhaps mis-spelled or defined by a module not included in the server configuration

I remove and works well, but how can i fix that?

 

Any idea?
Thanks