Error 2 "Could not load file or assembly 'NationalInstruments.UI.WindowsForms"

Updated Sep 15, 2025

Reported In

Software

  • Measurement Studio

Issue Details

When I run my program in Visual Studio 2013 I continue to get this error: 

Error 2: 'Could not load file or assembly 'NationalInstruments.UI.WindowsForms, Version=8.9.35.246, Culture=neutral, PublicKeyToken=18cbae0f9955702a' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference.

Where can I download NationalInstruments.UI.WindowsForms.dll?

Solution

The NationalInstruments.UI.WindowsForms.dll is part of the Measurement Studio Installation. To get this dll on your computer you will need to download and install Measurement Studio. 

Other Support Options

Ask the NI Community

Collaborate with other users in our discussion forums



Request Support from an Engineer

A valid service agreement or active software subscription may be required, and support options vary by country.