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# Troubleshooting

## Error Log

While working with REQ files, errors and information from processing issues are presented in the Messages pane. A running log of errors and messages are reatined in the errors.txt file. For more information, refer to Requirements Editor Error Log.

## Method not found: '!!0[] Stystem.Array.Empty()

If you recieve `Method not found: '!!0[] Stystem.Array.Empty()'` error when opening an REQ, verify you have the correct version of .NET on your machine.

## 3-Way Comparison error

If you receive an error when performing a 3-Way comparison, verify that you have installed Visual Studio 2013 Update 5 and Team Explorer. Both are supplied in the install folders.

## Could not load file or assembly

`Could not load file or assembly 'XmlNotepad, Version=1.0.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. The system cannot fine the file specified.`

If you receive this error, perform the following.

1. Uninstall the Requirements and Content Editor application.
2. Remove the following folder and all items within: C:\Program Files (x86)\Wolters Kluwer\Requirements Editor 3\
3. Install the latest version of Requirements and Content Editor.

## Preview unavailable: Error executing document

If you receive an error stating `Preview unavailable: Error executing document` (see example below), delete the Core folder that is located here: C:\Users\{user.name}\AppData\Local\Wolters Kluwer\RequirementsEditor\3.0.
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