I have a Python web app and I want to define a general class or function for processing web pages and call it from a more specific class for specific page instances. 

**Error:** 

> 
> metaclass conflict: the metaclass of a derived class must be a (non-strict) subclass of the metaclasses of all its bases
> 
> 
> 

I have checked all the StackOverflow questions & answers about that error message and did not understand the explanations given (and I found an article about metaclasses that I didn't understand - OOP is not really my thing). I also looked at all the StackOverflow questions & answers about calling a class method from another class (and didn't understand them either).

**Code:**

```
import webapp2
from datetime import datetime, timedelta

from google.appengine.ext import ndb
from google.appengine.api import users

import admin_templates
import authenticate

class myPage(webapp2.RequestHandler):
    def get(pageInstance):
        pageInstance.outputHtml()

    def outputHtml(pageInstance,pageTitle,pageContent):
        adminLink = authenticate.get_adminlink()
        authMessage = authenticate.get_authmessage()
        adminNav = authenticate.get_adminnav()
        pageInstance.response.headers['Content-Type'] = 'text/html'
        html = admin_templates.base
        html = html.replace('#title#', pageTitle)
        html = html.replace('#authmessage#', authMessage)
        html = html.replace('#adminlink#', adminLink)
        html = html.replace('#adminnav#', adminNav)
        html = html.replace('#content#', pageContent)
        pageInstance.response.out.write(html)
        pageInstance.response.out.write(admin_templates.footer)

class AuditorsPage(webapp2.RequestHandler, myPage.outputHtml):
    def get(self):
        self.output_auditors()

    def output_auditors(self):
        self.outputHtml(admin_templates.auditors_title, admin_templates.auditors_content)

```

How do I call the `outputHtml` method in the `myPage` class from the `AuditorsPage` class without getting a metaclass error?