IBM Rational Application Developer JDK error when starting

Hi i installed IBM RAD on win7 32 bit edition.

After launching RAD it gives an error

Could not find the main class: org.eclipse.jdt.internal.launching.support.LibraryDetector. Program will exit

And later

Could not find the main class 开发者_StackOverflow社区Program will exit

How can i fix this.

Note :I tried to install ibm rad on ubuntu it does not start there too.

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Ubuntu is not supported, even in RAD 8. For Windows 7 support, you need RAD 7.5.5. If, as you indicate in a comment, you're running RAD 7.5, that's not a supported configuration.

See here for the platform support statements for RAD.

In other words, you need to upgrade to RAD 7.5.5 at a minimum.

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Your installation is broken. Uninstall it and try again without any deviation from what the installation manager suggests.