Your PC - not the calculator - printed this message. It means that the PC tried to execute the Java compiler, but couldn't find the program. Either the Java compiler is not installed, or the PATH environment variable is not set correctly.
To install the Java compiler follow the instructions for installing J2SE at java.sun.com
To fix the PATH environment variable:
right-click on My Computer,
select Properties,
select Advanced System settings,
select environment variables,
edit or create a new variable called PATH in the system or user settings with the path of the javac.exe program. This is often found in c:Program FilesJavain (it's in a java...bin directory somewhere)
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