Install4j Error instantiating Actions - install4j

I am changing the installer on an application and in the install4j IDE I am getting the error "Error instantiating (class-path-to-action)". I don't know what is causing the error or what to do to fix it.
This is the second time I have come across this while using the install4j IDE, although the first time the error disappeared once I had built the project and closed eclipse.
This time round I have tried opening up the install4j file right after a restart and I am getting the same error, with no luck in getting rid of it.
Can someone enlighten me on what could be causing this, or how to fix it?

You can find more information in the file %TEMP%\install4j_error.log about the exception. Probably the class path configured on the Installer->Custom code & Resources is not correct.

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Did you go through this URL http://michaelzanussi.com/?p=468
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See this thread:
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