Question : J2Me demo building failed

I have downloaded J2ME Wireless Toolkit 2.0 and j2sdk1.4.2_10. But when I run the demo project from the Wireless Toolkit, it give me the following error :

Project settings saved
Building "UIDemo"
C:\WTK20\apps\UIDemo\src\alert\AlertDemo.java:112: cannot access java.lang.StringBuilder
file java\lang\StringBuilder.class not found
                        typeStrings[typeIndex] + " Alert, Running " + timeoutStrings[timeoutIndex]);
                                                                    ^
com.sun.kvem.ktools.ExecutionException
Build failed


WHat is the problem?

Answer : J2Me demo building failed

you need the StringBuilder.class  do a search on your computer and just copy to the path.
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