Hi, this looks very promising to me, but unfortunately I don't get it to w

Hi,
this looks very promising to me, but unfortunately I don’t get it to work with Vaadin 20. Alway get an java.lang.IllegalStateException.
Does anybody else have the same issues?
Regards Georg

Further info:
The problem is present with Tomcat 8. The addon is working with Springboot.
v-stepper.js is added to node_modules/@vaadin/flow-frontend/ but the NpmTemplateParser is not able to find it.

Stacktrace:
java.lang.IllegalStateException: Couldn’t find the definition of the element with tag ‘v-stepper’ in any template file declared using ‘@JsModule’ annotations. Check the availability of the template files in your WAR file or provide alternative implementation of the method getTemplateContent() which should return an element representing the content of the template file
at com.vaadin.flow.component.polymertemplate.NpmTemplateParser.getTemplateContent(NpmTemplateParser.java:155)
at com.vaadin.flow.component.polymertemplate.TemplateDataAnalyzer.parseTemplate(TemplateDataAnalyzer.java:217)
at com.vaadin.flow.component.polymertemplate.TemplateInitializer.(TemplateInitializer.java:100)
at com.vaadin.flow.component.polymertemplate.PolymerTemplate.(PolymerTemplate.java:94)
at com.vaadin.flow.component.polymertemplate.PolymerTemplate.(PolymerTemplate.java:109)
at com.mlottmann.vstepper.VStepper.(VStepper.java:53)