This might be related to the Java nature or builder missing from the 
.project file. For Mercurial projects it's a good idea to check this file 
in so that Eclipse knows what to do. Here's an example .project file. Close 
and open the project after editing this file

<?xml version="1.0" encoding="UTF-8"?>
<projectDescription>
    <name>myProjectName</name>
    <comment>Project description</comment>
    <projects>
    </projects>
    <buildSpec>
        <buildCommand>
            <name>org.eclipse.jdt.core.javabuilder</name>
            <arguments>
            </arguments>
        </buildCommand>
    </buildSpec>
    <natures>
        <nature>org.eclipse.jdt.core.javanature</nature>
    </natures>
</projectDescription>



On Monday, 21 October 2013 14:34:00 UTC-4, Kisamegr wrote:
>
> I'm trying to run an applet from the mercurial project, but the "Run as 
> Applet" option is not available when i right-click the applet file. To 
> bypass that, I click to "Run configurations" to make a new applet 
> configuration for the project. But the project is not shown when i click 
> the browse button in the "Project" field. I tried to manually enter the 
> project and the applet file, but when i hit run i get this error: 
>
> "Launching %configuration_name%" has encoundered a problem. Launch 
> configuration %configuration_name% references non-existing project 
> %project_name%.
>
> (I put %configuration_name% and %project_name% instead of the real names, 
> cause they are irrelevant)
>
>
> A work arround i found to this, is to create an empty java project and 
> manually link all the mercurial project's source to the empy one. But I 
> have to alter all the package names (and declarations inside every java 
> file) every time someone changes/adds classes, and add links to every new 
> file added, which is time consuming and worthless,and i can't go on with 
> this.
>
> I'm still searching for a solution, but I really need some help!
>

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