Application run - The process was terminated due to an unhandled exception. System.IO.FileNotFoundException

Question

We have an WinForms application published by click-once.
When starting the application we get these two errors from the win logs.

.net version 4.8 is installed on the machine
OS: Windows Server 2019 Standard
the machine is up-to-date

Please can someone help me with whether this is an issue with .net installation?

Source: .NET Runtime
Event ID: 1026
Application: MyApp.exe
Framework Version: v4.0.30319
Description: The process was terminated due to an unhandled exception.
Exception Info: System.IO.FileNotFoundException
at MyApp.Program.Main()

Source: Application Error
Event ID: 1000
Faulting application name: MyApp.exe, version: 1.0.0.0, time stamp: 0x62fcbd25
Faulting module name: KERNELBASE.dll, version: 10.0.17763.3287, time stamp: 0xd3d15282
Exception code: 0xe0434352
Fault offset: 0x00123f12
Faulting process id: 0x234
Faulting application start time: 0x01d8b23a7b10012a
Faulting application path: C:\Users\AppData\Local\Apps...\MyApp.exe
Faulting module path: C:\Windows\System32\KERNELBASE.dll
Report Id: ...
Faulting package full name:
Faulting package-relative application ID:

Answer 1

Looks like your application is trying to open a file that does exist. Perhaps you expected it to be part of the installation, or it’s using the wrong path.

Answer 2

Hello,

I hate to point out the obvious, but System.IO.FileNotFoundException means the program did not find the file you specified. So what you need to do is check what file your code is looking for in production.

To see what file your program is looking for in production (look at the FileName property of the exception), try these techniques:

• write to a debug log,
• use Visual Studio Attach to Process, https://learn.microsoft.com/en-us/previous-versions/visualstudio/visual-studio-2015/debugger/attach-to-running-processes-with-the-visual-studio-debugger?view=vs-2015&redirectedfrom=MSDN
• use Visual Studio Remote Debugging https://learn.microsoft.com/en-us/previous-versions/visualstudio/visual-studio-2015/debugger/remote-debugging?view=vs-2015&redirectedfrom=MSDN

Then look at the file system on the machine and see if the file exists. Most likely the case is that it doesn't exist.

Bear in mind that some applications don't use the latest .NET distribution, but updates of the 3.5, 2.0... so you might want to contact the WinForm application manufacturer in order to retrieve the per-requisites for running the application.

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