The system cannot find the file specified.

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...

Antivirus

Your antivirus can in some cases block for the Gant Chart program. To solve this exclude the program/folder from the virus scan.