Mysql won't start with replication

[Ruud van Dijk]

The next piece of code comes out my.cnf:

# The MySQL server
[mysqld]
port = 3306
socket = /var/lib/mysql/mysql.sock
skip-locking
old-passwords
max_connections=500
#max_join_size=25000000
wait_timeout=30
thread_cache_size = 64
key_buffer_size = 512M
query_cache_size = 512M
query_cache_limit = 64M
max_heap_table_size = 512M
key_buffer = 512M
max_allowed_packet = 16M
table_cache = 6144
sort_buffer_size = 64M
join_buffer_size = 750M
net_buffer_length = 8K
read_buffer_size = 2M
read_rnd_buffer_size = 512K
myisam_sort_buffer_size = 512M
tmp_table_size = 1024M
innodb_buffer_pool_size = 512M

log-bin = /var/log/mysql/mysql-bin.log
binlog-do-db= mydb
server-id=1

long_query_time = 10
log-slow-queries

[mysqldump]


I inserted:
log-bin = /var/log/mysql/mysql-bin.log
binlog-do-db= mydb
server-id=1

I made the directory /var/log/mysql/ so it exists and it's empty.

But when i try to start de mysqld deamon it gives error with starting without an error code
Can someone help me with this problem?