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This error occurs when I try to open my project. It says my project "is not open and cannot be set as main". So, I can't even open it. I already tried to reinstall Netbeans.
Created attachment 33363 [details] messages.log file
It looks like some of your tomcat configuration file is broken (missing end tag </Context>. Unfortunately from log it is not possible to find out what file it is. Dispatching to j2ee.
The fact that the context.xml file is not parsable does not seem to have anything to do with this issue. The message log does not seem to be much helpful in this case. Marcio, what project type is it? Is it a web project, ejb project...? BTW, would it possible to share your project so that we could reproduce this issue?
There is not much we can do with the current info, closing as INVALID.