Ensure your application architecture matches the runtime. For example, a 64-bit application requires the 64-bit MATLAB Runtime. Writing Text in MATLAB
For developers, this DLL is critical for deploying MATLAB functionality outside the development environment. Always verify version alignment with your compiled application.
These errors can manifest in various ways, including:
"The program can't start because mclmcrrt9_9.dll is missing from your computer."
Matlab R2015b 9.0 Runtime mclmcrrt9_0.dll attempting to load mclmcrrt9-9.dll
For further assistance and information on mclmcrrt9-9.dll, you can:
:
Open the Windows Start Menu, search for , and click enter. Click the Environment Variables button at the bottom right.
mclmcrrt9-9.dll provides the core runtime environment for: Ensure your application architecture matches the runtime
: The MCR is installed, but its \runtime\win64 folder is not included in the Windows System Path environment variable.
If the software you are trying to use came with its own installer, it might have failed to package the Runtime correctly. Try uninstalling the program, restarting your computer, and running the installer again—ideally as an Administrator 4. Verify Bit Architecture (32-bit vs. 64-bit)
in an elevated Command Prompt. Then, reinstall the latest (both x86 and x64) from Microsoft.
The most common cause. The application requires the R2020b (v9.9) runtime, but it hasn't been installed. mclmcrrt9-9
regsvr32 "C:\Program Files\MATLAB\MATLAB Runtime\v99\bin\win64\mclmcrrt9-9.dll"
You cannot just download this single .dll . The MCR includes:
Matlab R2015b 9.0 Runtime mclmcrrt9_0.dll attempting to load
This is the definitive fix. You must download the version that matches the application's requirements. Go to the MathWorks Official MATLAB Runtime download page . Locate .