You need to set JCreator's JDK profile to let JCreator know where to look for the jpb folder. To begin, pull down JCreator's Configure menu and choose Options ...
Select JDK Profiles from the list box on the left side
Select JDK version 1.4.2
Note: Do not be concerned if the version number on your computer is slightly different than 1.4.2
Press the Edit button
Press the Add button and select Add Path ...
Note: Do not be concerned if the current class paths in your center list box do not match this screen snapshot exactly.
Use the file browser that appears to browse to C:\jdk1.4.2_05\jre\lib\ext\
Note: The path to folder ext might differ slightly on your computer.