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What to do when you see “Object reference not set to an instance of an object” message when installing FenestraPro in Windows?

Written by Mike Flood

June 18, 2019

During the installation of FenestraPro Premium, in some cases you may see the message: “Object reference not set to an instance of an object”.

This message appears when the User does not have a defined “Users” security rule associated to the “Constructions.xml” file in Revit or the file is not inheriting the security rules from the parent folder. It is possible to set this rule permission manually.

FenestraPro needs permission to edit this file which contains the Construction Types in Revit. FenestraPro Linc has a database of Glazing Types which can be added to Revit’s own list.  In order to this, FenestraPro needs security permissions to write to this file. Sometimes these are restricted and may first need to be modified in Windows.

Note: Please seek advice from an experienced computer technician if you are not comfortable with the following instructions for advanced editing of files and settings on your computer.

To edit permissions for this file, go to the “Constructions.xml” file (usually is in C:\\Program Files\\Autodesk\\Revit 2019\\en-US) and then right click on the file -> Properties -> Security.

Note: Please seek advice from an experienced computer technician if you are not comfortable with the following instructions for advanced editing of files and settings on your computer.

How to locate the “Constructions.xml” file for Revit in Windows?

If you use a different language from US English, you will need to navigate to the version of the file with your preferred language. These will be named such as: En-GB (English Great Britain), fr-FR (French), es-ES (Spanish), de-DE (German), etc.

The path to these files will then be:

C:\\Program Files\\Autodesk\\Revit 2019\\en-GB

C:\\Program Files\\Autodesk\\Revit 2019\\fr-FR

C:\\Program Files\\Autodesk\\Revit 2019\\es-ES  and so on.

 If you are using Revit 2018 or Revit 2020, the path will be slightly different:

Eg. C:\\Program Files\\Autodesk\\Revit 2018\\en-US

or

       C:\\Program Files\\Autodesk\\Revit 2020\\en-US)

If the file is not inheriting the rules from the parent folder you will see this:

In this case follow the next steps:

  1. Go to Advanced -> Continue -> Enable inheritance -> Ok
  2. Close the Properties window and open again
  3. Go to Edit and from the list of users select the one that contains “Users”, then check “Full control”
    Press OK

If you don’t have a defined “Users” rule at all you will see this:

In this case follow the next steps:

  1. Go to Advanced -> Add -> Select a principal
  2. Enter “Users” and click  Check Names
  3. The main “Users” group name should appear in the text box
  4. Press OK
  5. Tick “Full control” and press OK

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