# "Warning Trying to load a different Qt GUI library"

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## Symptoms¶

You get warning messages similar to this in the Runner/Server Log view when you try to start your application from Squish:

Preload (71840001): Warning: Trying to load a different Qt library (C:\Qt\4.7.1\bin\QtCore4.dll) than the AUT uses (possibly C:\Program Files\MyApp\QtCore4.dll, C:\Program Files\MyApp\QtGui4.dll) - hooking into the AUT is likely to fail.

## Explanation¶

This typically means that you configured Squish to use the system's Qt libraries, for example, those in `C:\Qt\4.7.1\bin`. Squish should be using the Qt libraries used by the application; for example, if the application's Qt `.dll` files are in `C:\Program Files\MyApp`, then that is the folder that Squish should use when it needs the Qt libraries.

## Solution¶

Run the Squish setup program (`SQUISHDIR\setup`) again, and configure it to use the Qt libraries that your application uses.