How to use the @theia/plugin-ext/lib/common/types.LogType.Error function in @theia/plugin-ext

this.hostedInstanceProcess.stderr.addListener('data', data => {
                this.hostedPluginSupport.sendLog({ data: data.toString(), type: LogType.Error });
            });

runWatchCompilation(uri: string): Promise {
        const pluginRootPath = this.getFsPath(uri);

        if (this.watchCompilationRegistry.has(pluginRootPath)) {
            throw new Error('Watcher is already running in ' + pluginRootPath);
        }

        if (!this.checkWatchScript(pluginRootPath)) {
            this.hostedPluginSupport.sendLog({
                data: 'Plugin in ' + uri + ' doesn\'t have watch script',
                type: LogType.Error
            });
            throw new Error('Watch script doesn\'t exist in ' + pluginRootPath + 'package.json');
        }

        return this.runWatchScript(pluginRootPath);
    }