Mclmcrrt9-9.dll ((new))

The target computer does not have the core MATLAB Runtime environment installed.

Unlike a standard DLL, you cannot call regsvr32 on this file or add it manually to a project. It is loaded only by executables that were specifically compiled against MCR version 9.9.

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 . mclmcrrt9-9.dll

When this error pops up, Windows is telling you it cannot find or read the file. The most frequent causes include:

Download and install the version corresponding to your operating system (typically Windows 64-bit). 2. Verify the Path Variable The target computer does not have the core

This is actually very common. The MATLAB Runtime is designed to allow multiple versions to coexist peacefully on the same computer. The mclmcrrt proxy layer is specifically designed to manage this. You can simply install each required version of the MCR, and each program will automatically call the correct one.

: Applications are strictly tied to specific versions of the runtime. An application compiled in R2015b requires version 9.0; it generally cannot use version 9.1 or 8.5. Bit-depth Conflicts This is the definitive fix

Even with full MATLAB installed, compiled applications look for the standalone MCR, not the MATLAB installation. The paths are different. You must still install MCR 9.9 separately.