How to use the pscript.stubs.window.console.error function in pscript

el.id = name
                el.innerHTML = code
                window.flexx.asset_node.appendChild(el)
            elif kind == 'CSS':
                el = window.document.createElement("style")
                el.type = "text/css"
                el.id = name
                el.innerHTML = code
                window.flexx.asset_node.appendChild(el)
            else:
                window.console.error('Dont know how to DEFINE ' +
                                     name + ' with "' + kind + '".')
        elif cmd == 'OPEN':
            window.win1 = window.open(command[1], 'new', 'chrome')
        else:
            window.console.error('Invalid command: "' + cmd + '"')
        return command

def on_ws_error(self, evt):
            self._ws = None
            self.status = 0
            window.console.error('Socket error')

session.send_command("INFO", str(msg))
        def warn(msg):
            window.console.ori_warn(msg)
            for session in self.sessions.values():
                session.send_command("WARN", str(msg))
        def error(msg):
            evt = dict(message=str(msg), error=msg, preventDefault=lambda: None)
            on_error(evt)
        def on_error(evt):
            self._handle_error(evt)
        on_error = on_error.bind(self)
        # Set new versions
        window.console.log = log
        window.console.info = info
        window.console.warn = warn
        window.console.error = error
        # Create error handler, so that JS errors get into Python
        window.addEventListener('error', on_error, False)

# With this method, sourceURL does not work on Firefox,
                # but eval might not work for assets that don't "use strict"
                # (e.g. Bokeh). Note, btw, that creating links to assets does
                # not work because these won't be loaded on time.
                el = window.document.createElement("script")
                el.id = name
                el.innerHTML = code
                window.flexx.asset_node.appendChild(el)
            elif kind == 'CSS':
                el = window.document.createElement("style")
                el.type = "text/css"
                el.id = name
                el.innerHTML = code
                window.flexx.asset_node.appendChild(el)
            else:
                window.console.error('Dont know how to DEFINE ' +
                                     name + ' with "' + kind + '".')
        elif cmd == 'OPEN':
            window.win1 = window.open(command[1], 'new', 'chrome')
        else:
            window.console.error('Invalid command: "' + cmd + '"')
        return command