unit slapd.service cannot be found
 

I have installed all the packages related to the openldap , but now when i am trying to run the service with the name slapd it is giving me the error of "unit slapd.service cannot be found". Can anyone help me with this problem.
I am working on Centos Linux stream currently.

would be mice to know what OS is it (exactly), how did you try to install and what (exactly).