1. **License Not Recognized Error** Some users face issues with Aimsun Next not detecting the license key correctly. If you encounter this error, verify that the Sentinel drivers are properly installed. To manually reinstall, go to the `licenses\drivers\hasp` directory in your Aimsun installation folder and run the `setupClean.bat` file. This should help re-establish the connection and recognize the license key.

Aimsun license troubleshooting

2. **Simulation Stuck or Vehicle Movement Issues** Occasionally, simulations may freeze or vehicle movements appear incorrect. Aimsun includes a built-in tool called "Check and Fix" accessible from the context menu of your experiment. Running this tool helps identify and resolve model errors that might disrupt smooth simulation flow.

3. **Installation Errors** If the installation process halts or shows errors, ensure your system matches the software’s minimum requirements. For Windows users, missing components like Visual Studio redistributables may need to be installed manually. Locate the `VC_redist.x64.exe` file in the "Extras" folder to complete installation smoothly.

4. **Python Script Errors** When executing Python scripts, some users report missing modules such as "xlrd." Ensure that all required Python packages are installed in your environment. Adding a simple line in your script to include the correct path can also prevent issues: 


        SITEPACKAGES = "C:\\Python37\\lib\\site-packages"
        if SITEPACKAGES not in sys.path:
            sys.path.append(SITEPACKAGES)

Aimsun script troubleshooting

5. **Performance Optimization** During larger simulations, Aimsun may become slow or even crash. To avoid this, make sure your system meets the recommended specs, close unnecessary applications, and, for high-demand simulations, try reducing model complexity or using higher-performance hardware.

6. **3D Visualization Issues** In some cases, 3D models might not display as expected. Updating your graphics card drivers to the latest version usually resolves this. Aimsun requires OpenGL 2.0 or higher, so make sure to install the latest drivers from your hardware provider to support accurate 3D rendering.

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