PHP Warning in log or occ command

hay gues,
bevor i start sorry for my bad English!

I have since yesterday an error in my logfile and on my commandline with occ.

PHP Warning: PHP Startup: Unable to load dynamic library 'ldap.so' (tried: /usr/lib/php/20170718/ldap.so (/usr/lib/php/20170718/ldap.so: cannot open shared object file: No such file or directory), /usr/lib/php/20170718/ldap.so.so (/usr/lib/php/20170718/ldap.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0

What should the error mean or what do I have to get away then? I also have a problem with the external storage app with a smb drive. Does that have something to do with it?

My last contributions:

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thx for help

Looks like there’s a module missing… as stated in the error. What OS is that?

I had upgraded on Ubuntu 18.04.1 last week

The error message tells you that the module is not installed.

https://www.qwant.com/?q=Unable+to+load+dynamic+library+‘ldap.so’

No.

Okay, i had now installed the ldap-php module now it is working!
But why nedd nextcloud this extention?

For authentification with LDAP.