LDAP slapd server not starting -> Modify ldap when server is offline

so im trying to get a LDAP server with ssl certificate running. I need to change the config by changing cn=config with ldapmodify and therefore cannot use a slapd.conf. It was quite hard finding proper guides on how to set it up with this… im relative new to linux…

Currently the slapd server is not starting and neither a systemctl status nor a journalctl had any information.

I think the problem is that for the ssl certificate I generated a key, so 2 .pem files one as the cert and one as key and then I ran

sudo ldapmodify -Y EXTERNAL -H ldapi:/// -f ldap.ldif

to load the config.
Content of ldap.ldif:

dn: cn=config
changetype: modify

add: olcTLSCertificateFile
olcTLSCertificateFile: /etc/ldap/ssl/ldapcert.pem
-
add: olcTLSCertificateKeyFile
olcTLSCertificateKeyFile: /etc/ldap/ssl/keys/ldapkey.pem
-
add: olcTLSCipherSuite
olcTLSCipherSuite: TLSv1+RSA:!NULL
-
add: olcTLSVerifyClient
olcTLSVerifyClient: never

I had a typo in this file when I loaded it and then the problem arised.
My question is: How can I load the new (without typo) ldap.ldif file to the slapd server, when its shut down. When trying to run ldapmodify it says that he cannot make a connection to the ldap server which makes sense when it’s offline.

To get more information when I try to start the server I ran the following command

/usr/sbin/slapd -h "ldapi:/// ldap://:7389/ ldaps://:7636/" -d -1

and got some more information: (part of the output)

daemon: bind(8) failed errno=98 (Address already in use)
lap_open_listener: failed on ldapi:///
lapd stopped.
onnections_destroy: nothing to destroy.

But I don’t know what to do with this information and I didn’t found similar problems in the internet.

I hope someone can help me!

Greeting Jonas