how can I solve this error?

[Strike]

Fatal Error: Unable to find package java.lang in classpath or bootclasspath

When I use lejosjc, the computer sends an error message. Days ago, the software was able to compile very good, but I changed a folder and I put leJOS and inside of it the NXJ folder. I changed the environment variables and the error appeared. When I put everything as it was before, the error kept appearing.

thanks..

[imaqine]

Were you ever able to fix your error?