I have recently started using Squish for an application I made with Qt.
After installing it I was able to run some tests on the application, but now I am getting an error as shown below:

The Runner/Server log shows:
S Squish tools: [2025-11-02T08:18:20.359+0330] 08:18:20:359 Info: Connection from 127.0.0.1:2429.
S Squish tools: [2025-11-02T08:18:20.447+0330] 08:18:20:447 Info: Connection to 127.0.0.1:2429 closed.
R: [2025-11-02T08:18:20.695+0330] 2025-11-02T08:18:20 START Start 'appstarter' Test 'appstarter' started
S Squish tools: [2025-11-02T08:18:22.730+0330] 08:18:22:730 Info: Connection from 127.0.0.1:2431.
S Squish tools: [2025-11-02T08:18:22.744+0330] 08:18:22:743 Info: Starting AUT 'viewer_client_desktop' with wrappers Qt: C:\Program Files\Squish for Windows 9.1.0\bin\dllpreload.exe C:\Users\a.ghezelbash\Desktop\vms_client_desktop\viewer_client_desktop.exe
S Squish tools: [2025-11-02T08:18:22.745+0330] 08:18:22:745 Warning: Could not start AUT 'viewer_client_desktop': The system cannot find the file specified.
R: [2025-11-02T08:18:22.747+0330] 2025-11-02T08:18:22 FATAL Starting application Application 'viewer_client_desktop' could not be started. An error occurred while starting the AUT.
R: [2025-11-02T08:18:22.748+0330] 2025-11-02T08:18:22 END End of test Giving up after error
R: [2025-11-02T08:18:22.749+0330] *******************************************************
R: [2025-11-02T08:18:22.749+0330] Summary:
R: [2025-11-02T08:18:22.749+0330] Number of Test Cases: 0
R: [2025-11-02T08:18:22.749+0330] Number of Tests: 0
R: [2025-11-02T08:18:22.750+0330] Number of Errors: 0
R: [2025-11-02T08:18:22.750+0330] Number of Fatals: 1
R: [2025-11-02T08:18:22.750+0330] Number of Fails: 0
R: [2025-11-02T08:18:22.751+0330] Number of Passes: 0
R: [2025-11-02T08:18:22.751+0330] Number of Expected Fails: 0
S Squish tools: [2025-11-02T08:18:22.752+0330] 08:18:22:751 Info: Connection to 127.0.0.1:2431 closed.
R: [2025-11-02T08:18:22.752+0330] Number of Unexpected Passes: 0
R: [2025-11-02T08:18:22.752+0330] Number of Warnings: 0
R: [2025-11-02T08:18:22.753+0330] *******************************************************
R: [2025-11-02T08:18:22.765+0330] squishrunner exited with value -1, started with arguments: [C:\Program Files\Squish for Windows 9.1.0\bin\squishrunner.exe, --host, localhost, --port, 1305, --debugLog, palw, --startapp, --suitedir, C:\Users\a.ghezelbash\Desktop\vms_client_desktop\suite_test, --cwd, @app, --aut, viewer_client_desktop]
In the log above, it says that the file dllpreload.exe cannot be found in C:\Program Files\Squish for Windows 9.1.0\bin\
and there is no such file in the installation directory.
I even uninstalled and reinstalled Squish, but it is still showing the same error.
The system cannot find the file specified.hints the possible problem. You might want to check the location ofviewer_client_desktopapplication.