These messages aren't critical, you can ignore them. What's important is, that you don't crash the application anymore.

The problem is the same as in your other thread: you need to take care of the destruction order of your qobjects.

Hi. already fixed in https://bugreports.qt.io/browse/QTBUG-46074

resolved !!
i've chenged

m_pNetworkAccessManager->get(request);

by

request.setRawHeader("Content-Type", "application/x-www-form-urlencoded"); QByteArray par=""; m_pNetworkAccessManager->post(request,par);

I had the same question as you,I think ,maybe your project is short of the '.js' file.
You can add the '.js' file to the project-resource , then have a try.

By the way ,In my project , It has the ',js' file,but there is still a quetion.
In my projtct,I want load a HTML that use google maps api and show maps offline ,oc course I have doemloaded the map titles .the HTML can work in any browser, such as chrome, IE ,firefox and so on,but the html doesnot work in Qt5.6.0 which I use the QWebEngineWidget class.
The error is :
js: Uncaught TypeError:google.maps.LatLng is not a function
js: Uncaught TypeError:google.maps.MAP is not a function

So,this is my question,I haven't solved。

@Hans-Dijkema I have yet to try Qt 5.7 beta, but... it seems to me like you haven't installed QtWebEngine?...

@p3c0 That worked, thanks for your help.

Hi and welcome to devnet,

If you can reproduce this easily with a minimal compilable example, you should go to the bug report system to see if it's something known. If not please consider opening a new report providing that example and the guidelines to trigger the bug.

Just an FYI, disabling network adapters (used by virtual machines) in Device Manager solved the sluggishness for me.