Phive XRechnung validation erroring [SAX] cvc-elt.1.a: Deklaration des Elements "rsm:CrossIndustryInvoice" kann nicht gefunden werden.

build.gradle

plugins {
    id 'groovy'
    id 'java'
}

group 'org.example'
version '1.0-SNAPSHOT'

repositories {
    mavenCentral()
}

dependencies {
    implementation 'org.codehaus.groovy:groovy-all:3.0.5'
    testImplementation 'org.junit.jupiter:junit-jupiter-api:5.6.0'
    testImplementation 'org.junit.jupiter:junit-jupiter-api:5.7.0'
    testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine'
    testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.7.0'
    implementation 'com.helger.phive.rules:phive-rules-xrechnung:2.1.5'
    implementation 'com.helger.phive.rules:phive-rules-en16931:2.1.5'
    implementation 'com.helger.phive:phive-engine:7.2.0'
}

test {
    useJUnitPlatform()
}

Main.java

import java.io.File;
import java.util.Locale;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.w3c.dom.Document;

import com.helger.commons.error.IError;
import com.helger.phive.api.execute.ValidationExecutionManager;
import com.helger.phive.api.executorset.IValidationExecutorSet;
import com.helger.phive.api.executorset.VESID;
import com.helger.phive.api.executorset.ValidationExecutorSetRegistry;
import com.helger.phive.api.result.ValidationResultList;
import com.helger.phive.en16931.EN16931Validation;
import com.helger.phive.engine.source.IValidationSourceXML;
import com.helger.phive.engine.source.ValidationSourceXML;
import com.helger.phive.xrechnung.XRechnungValidation;

/**
 * [error] [SAX] cvc-elt.1.a: Deklaration des Elements "rsm:CrossIndustryInvoice" kann nicht gefunden werden. (org.xml.sax.SAXParseException: cvc-elt.1.a: Deklaration des Elements "rsm:CrossIndustryInvoice" kann nicht gefunden werden.)
 * [error] @ /schematron/1.3.3/cii/xslt/EN16931-CII-validation.xslt Failed to create JAXB context for package 'com.helger.schematron.svrl.jaxb' using ClassLoader jdk.internal.loader.ClassLoaders$AppClassLoader@30946e09 (java.lang.IllegalArgumentException: Failed to create JAXB context for package 'com.helger.schematron.svrl.jaxb' using ClassLoader jdk.internal.loader.ClassLoaders$AppClassLoader@30946e09)
 * [error] @ /schematron/2.0.1/XRechnung-CII-validation.xslt Failed to create JAXB context for package 'com.helger.schematron.svrl.jaxb' using ClassLoader jdk.internal.loader.ClassLoaders$AppClassLoader@30946e09 (java.lang.IllegalArgumentException: Failed to create JAXB context for package 'com.helger.schematron.svrl.jaxb' using ClassLoader jdk.internal.loader.ClassLoaders$AppClassLoader@30946e09)
 */
public class Main
{
    public static void main (final String [] args)
    {
        /** mvn process-sources did not help either */
        System.out.println ("Hallo");
        final ValidationExecutorSetRegistry <IValidationSourceXML> aVESRegistry = new ValidationExecutorSetRegistry <> ();
        EN16931Validation.initEN16931 (aVESRegistry);
        XRechnungValidation.initXRechnung (aVESRegistry);
        System.out.println ("Finished VES Registry init");

        if (false)
            for (final IValidationExecutorSet <IValidationSourceXML> aves : aVESRegistry.getAll ())
            {
                System.out.println (aves.getID ().toString ());
            }
        final IValidationExecutorSet <IValidationSourceXML> aVES = aVESRegistry.getOfID (VESID.parseID ("de.xrechnung:cii:2.0.1"));
        System.out.println ("VES found: " + aVES);

        // final IValidationExecutorSet<IValidationSourceXML> aVES =
        // aVESRegistry.getOfID(VESID.parseID("eu.cen.en16931:cii:1.3.0"));
        if (aVES != null)
        {
            // Code for 6.x:
            final ValidationExecutionManager <IValidationSourceXML> aVEM = new ValidationExecutionManager <> (aVES);
            // What to validate?
            try
            {

                final String dateiname = "01-02.xml";
                final File xmlFile = new File (dateiname);
                System.out.println (xmlFile.getAbsolutePath ());
                System.out.println ("File exists: " + xmlFile.exists ());

                final DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance ();
                final DocumentBuilder dBuilder = factory.newDocumentBuilder ();
                final Document doc = dBuilder.parse (xmlFile);
                System.out.println ("Read XML document: " + doc);

                doc.getDocumentElement ().normalize ();
                final IValidationSourceXML aValidationSource = ValidationSourceXML.create (null, doc.getDocumentElement ());

                // Main execution
                final ValidationResultList aValidationResult = aVEM.executeValidation (aValidationSource);
                if (aValidationResult.containsAtLeastOneError ())
                {
                    System.out.println ("errors found:");
                    for (final IError valRes : aValidationResult.getAllErrors ())
                    {
                        System.out.println (valRes.getAsString (Locale.ENGLISH));

                    }
                }
                else
                {
                    System.out.println ("NO errors found ...");
                }
            }
            catch (final Exception e)
            {
                System.err.println (e.getMessage ());
            }
        }
    }
}