binding .jar class inner class

Hi guys,

i hv tried add a .jar in my project but i missed error:
Gravidade Código Descrição Projeto Arquivo Linha Estado de Supressão

Erro error: package com.pax.dal.IScanner does not exist
com.pax.dal.IScanner.IScanListener App1.Android C:\Users\wilson.vernay\source\repos\App4\App1\App1.Android\obj\Debug\MonoAndroid81\android\src\mono\com\pax\dal\IScanner_IScanListenerImplementor.java 8

.jar class :
package com.pax.dal;

public interface IScanner {
boolean open();

void start(IScanner.IScanListener var1);

void close();

public interface IScanListener {
    void onRead(String var1);

    void onFinish();

    void onCancel();
}

}

I tried this ->
and this -> public

but not have succeeded

=/