verifier and new extensions points

I write the plugin for Intellij 2018.*-2019.3

I use extensions points 

<extensions defaultExtensionNs="com.intellij">
    <openapi.vcs.ui.cloneDialog.VcsCloneDialogExtension
        implementation="com.microfocus.intellij.plugin.gitclient.clone.DmCloneDialogExtension"/>
</extensions>

and 

<extensions defaultExtensionNs="Git4Idea">
    <gitRepositoryHostingService
            implementation="com.microfocus.intellij.plugin.gitclient.repository.DmRepositoryHostingService"/>
</extensions>

for 2019.3 and earlier versions

I build my plugin with 2019.3 and install it on 2018.3 and 2019.3 and all work fine.

But when I check the plugin with verifier v.1.222 and IC 2018.3 (https://github.com/JetBrains/intellij-plugin-verifier) the last shows error:

 #Package 'com.intellij.openapi.vcs.ui.cloneDialog' is not found
Package 'com.intellij.openapi.vcs.ui.cloneDialog' is not found along with its 3 classes.
Probably the package 'com.intellij.openapi.vcs.ui.cloneDialog' belongs to a library or dependency that is not resolved by the checker.
It is also possible, however, that this package was actually removed from a dependency causing the detected problems. Access to unresolved classes at runtime may lead to **NoSuchClassError**.

How I can avoid verifier errors like this?