I just had this problem, Update Java plugin with Firefox and the error went away. I hope this helps
Perform a windows update, and make sure you have the latest version of java
I just found out on how to fix the problem Error 1721. Very easy when i saw it. Basically you go on [Control panel]->[Add or Remove progams] Then if it says JAVA 6 update 20 or below, remove it then download Java again! Once download it will work. If it doesnt then thats your prob. If it works, go to [Add or Remove progams] and check if it is Java 6 Update 30. I hoped this helped You Java team for your answer + Any1 who had this problem
When this happens it could be a number of things, either you could have a problem with the demo itself where you may not have activated your account or it has run out or it could be a java error. To fix the java error I recommend simply installing the latest version.
This error means that there was a call to a nonexistent class, but this was not caught by the compiler since the class existed when the file was compiled but was removed before running the .class file. To fix this problem try restoring any files you deleted to the SAME directory as your .class file. This error can also be fixed by changing the Java classpath to point to the locations of your files. The -cp command line option should help.
press alt at homescreen and hold alt down and press lglg an fing uncaught
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The error "expected public class MathPow.java" typically indicates that the Java compiler is expecting a public class declaration in the file named MathPow.java. In Java, the filename must match the public class name defined within the file. If the class is not declared as public or if the filename does not correspond to the class name, the compiler will throw this error. To fix it, ensure that the class is declared as public and that the filename matches the class name exactly.
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