The form has been closed. Xmlformview web part

When addding the xmlformview web part to a sharepoint page, you may get an error that fills the full page saying "The form has been closed". Since this error fills up the full page you will not be able to edit the properties of the web part that you have just added.

To fix this problem follow the steps below.

1. Navigate to the page library where the web part page is located
2. Click on the options on the page and click "Edit Properties"
3. At the bottom of the properties page, click on "Web Part Page Maintenance".
4. Using the web part maintenance page close the xmlformview web part
5. Go back to the page where you added the web part and click on add a webpart
6. Instead of choosing the xmlformview web part from the web part list click on advanced and select the xmlformview web part from the "Closed Web parts" list
7. Now the web part would be added and the web part properties displayed
8. Edit the web part properties and add the url of the infopath form in the xsn location field in the Data category
9. In the Feature Catergory set the editing status dropdown value to "editing"

Other websites recommend you to add the xmlformview web part again from the main list after closing the web part that you added first but that did not work for me.

Console Configuration File Error: XML Exception: Object reference Sharepoint

If you get the error below in your event viewer
Console Configuration File Error: XML Exception: Object reference not set to an instance of an objet

and the message Object reference not set to an instance of an object! at the area where you would expect your page editing toolbar then the reason is that the xml files in Editing Menu folder in the Master Page gallery are not in the Published state.

To fix this, just publish all the xml files in the folder Editing Menu and approve them!