The error message "searchBase must not be null (an Empty String is acceptable)" is specific to LDAP (Lightweight Directory Access Protocol) and it usually occurs when trying to perform a Search Operation on a directory server.

In the context of LDAP, the "searchBase" parameter specifies the starting point for the search operation. It is the distinguished name (DN) of the directory entry where the search operation should start. The error message is indicating that the "searchBase" parameter cannot be null, which means that it must contain a valid DN value.

However, an empty string is an acceptable value for the "searchBase" parameter. If you want to perform a search operation that covers the entire directory, you can specify an empty string as the value for the "searchBase" parameter.

To resolve this error, you need to make sure that a valid value is provided for the "searchBase" parameter. If you want to search the entire directory, you can use an empty string as the value for the "searchBase" parameter. If you need to specify a starting point for the search operation, make sure to provide a valid DN value for the "searchBase" parameter.

References

1. https://ldap.com/