The file Xceed.Wpf.Toolkit.dll must be in same place as the program. Try copy the file Xceed.Wpf.Toolkit.dll to same directory as Gantt.exe.
cannot find the file specified. A call to System.Diagnostics.Process.Start failed with this message:The system cannot find the file specified. The error is caused when the client can’t read the shared Gantt.exe file. Check if the client can access the Gant.exe file...
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Your antivirus can in some cases block for the Gant Chart program. To solve this exclude the program/folder from the virus scan.