Apache Internal Server Error

[adastra]

Can anyone help me out, I'm getting an Internal Server Error and I don't see what's wrong with my .htaccess.

This is it:

RewriteRule ^([a-z]{2})/?$ index.php?lang=$1

RewriteRule ^([a-z]{2})/eintragen/?$ join.php?lang=$1
RewriteRule ^([a-z]{2})/join/?$ join.php?lang=$1

RewriteRule ^([a-z]{2})/liste/?$ list.php?lang=$1
RewriteRule ^([a-z]{2})/list/?$ list.php?lang=$1

RewriteRule ^([a-z]{2})/liste/([0-9]+)/?$ list.php?lang=$1&p=$2
RewriteRule ^([a-z]{2})/list/([0-9]+)/?$ list.php?lang=$1&p=$2

RewriteRule ^([a-z]{2})/([a-z-]{4,})/?$ index.php?lang=$1&content=$2

It worked perfectly fine before I added these two lines:
RewriteRule ^{([a-z]{2})/liste/([0-9]+)/?$} list.php?lang=$1&p=$2
RewriteRule ^{([a-z]{2})/list/([0-9]+)/?$} list.php?lang=$1&p=$2

[dzysyak]

I have just tested your rules on my server and have not got any errors. May be the problem is somewhere else?

[bradgrafelman]

What do your error logs say? If you remove the RewriteRule lines, one-by-one, can you determine which line (if any) is causing this error?