Why do I get a Java Exception when starting MATLAB 6.1 (R12.1)?

Why do I get the following Java Exception when starting MATLAB 6.1 (R12.1)?

 java.io.FileNotFoundException: C:\WINNT\Profiles\username\Application Data\MathWorks\MATLAB\R12\matlab.prf

 at java.io.FileOutputStream.<init>(FileOutputStream.java:61)

 at java.io.FileOutputStream.<init>(FileOutputStream.java:106)

 at com.mathworks.services.Prefs.save(Prefs.java:512)

 at com.mathworks.services.Prefs$SavePrefsThread.run(Compiled Code)

Answer 1

[MathWorks Support Team]

This exception occurs when write permissions to the MATLAB.prf have been disabled. If you are receiving this error you should contact your system administrator to have permissions set to allow writing to this file.

As of MATLAB 6.5 (R13), it is now possible to read in from a preference file with read-only permissions.