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I'd like to use Graphviz from My system is Windows 7 Professional, 64bit, SP 1.

After standard installation I get the following error message twice when invoking dot.exe:

Title: dot.exe - System Error

Text: The program can't start because graph.dll is missing from your computer. Try reinstalling the program to fix this problem.

Invoking dot -V shows the version (dot - graphviz version 2.30.0 (20130114.0323)) after the two error messages in the console.

After the first message, the console shows Warning: Could not load "C:\Program Files (x86)\Graphviz2.30\bin\gvplugin_pango.dll" - can't open the module. This message is repeated after the second popup error message.

This also happens with the current development snapshot version. Setting the path environment variable to include "C:\Program Files (x86)\Graphviz2.30\bin" does not help. Running msiconfig /a graphviz-2.30.msi results in a permission error. Running msiconfig /a graphviz-2.30.msi from an Administrator command prompt succeeds, but the problem described above persists.

Upgrading .net to 4.5 did not help.

Thanks a lot, Carsten

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I reported this to the devel mailing list (…) – C-Otto Jan 23 '13 at 9:59

I hit the same error, was able to install v2.28 after uninstalling 2.30 and it worked:

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I'm sorry of that too, I used to install 2.28 that was working fine on Windows XP.

I have same problem with 2.30 on XP, that was corrected partially when I copied cgraph.dll to graph.dll in install repository. (as a result I have now syntax error, that I hadn't before).

That's a temporary solution, we must alert development team.

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up vote 1 down vote accepted

The windows downloads now only show version 2.28, not 2.30. As mentioned in the comments, 2.28 installs just fine.

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I had a problem with graphviz v2.3 and v3.0 (dot.exe).

I tried v2.0 and it worked. I advise everyone who had a problem to try it.

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