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C# Class Library throws FileNotFoundException while trying to load another library

I try to connect to a fiscal device with a C#.
I use this documentation to do so: http://integration.atol.ru/api-en/#connection-to-project
So basically I have a driver of the device installed on my PC (fprt10.dll) and there is a "wrapper" assembly that allows me to work with this driver from C# (Atol.Drivers10.Fptr.dll). I import this wrapper into my project as a reference.
I have the following constructor in my class:
public MyClass()
{
IFptr fiscalPrinter = new Fptr();
// Here comes several settings to configure connection
fiscalPrinter.applySingleSettings();
fiscalPrinter.open();
fiscalPrinter.beep();
fiscalPrinter.close();
}
To test the solution I use another application, that loads my Class Library as a dependency.
When I call a constructor of MyClass I get an exception:
System.IO.FileNotFoundException: Driver not installed
at Atol.Drivers10.Fptr.Fptr.loadDriver(String path)
at Atol.Drivers10.Fptr.Fptr..ctor()
at MySolution.MyClass.MyClass()
...
If I create instance of Fptr with a path to the driver
IFptr fiscalPrinter = new Fptr(#"C:\path\fptr10.dll")
I get the slightly different exception, but I believe the problem is the same:
System.IO.FileNotFoundException: Can`t load driver library "C:\path\fptr10.dll"
at Atol.Drivers10.Fptr.Fptr.raiseNotFoundError(String path, Exception reason)
at Atol.Drivers10.Fptr.Fptr.loadDriver(String path)
at Atol.Drivers10.Fptr.Fptr..ctor(String libraryPath)
at MySolution.MyClass.MyClass()
...
But when I create a Console Application and put in there exact same code (both versions with path and without), everything works: the device beeps, there are no exceptions.
What could be the reason for that behavior and how to fix this?

The issue may be one of the following
The test application is using 'target platform' different than the console application which works fine. The device driver folders expected for each platform could be different. e.g. Changing the targeted platform from 'any CPU' to 'x64' / 'x86' (depending on the type of OS where you are running it) will help
Try running the test application from admin command prompt. Permissions issue may reflect as 'file not found' (instead of 'file could not be loaded').
Use an assembly binding viewer tool to debug the issue further
Refer to Could not load file or assembly or one of its dependencies for more discussion and inputs on the assembly loading issues.

Thank you samiksc.
The issue was in the test app. The driver and OS that I use are both x64, but the test application is x86. With x86 driver everything works.

Access Denied when running Windows Service

I have created a Windows Service using ASP.Net Core 3.x and C#. I started with the new Windows Service template when I built the project. When I run it from my development environment or from a console window it runs fine. When I install it as a Windows Service and attempt to start the service I get an
"Error 5: Access is denied." error.
I tried numerous things which I will outline below to eliminate the error but nothing seemed to work so I downloaded the sample app provided by Microsoft, at sample
Same result...when I run the sample app from within Visual Studio it runs fine, when running as a service I get the Access Denied error.
I am running all of this on my local machine, which I am an admin on.
I originally tried to run it using the default Local System account; got the Access Denied error.
I changed the Log On As to my domain account, the same one I use to log into my local machine which is an admin on this machine; got the same Access Denied error.
My account has the privilege set to run as a service.
The Event Viewer just shows the one message which says "Access Denied", no other messages are created.
I believe the Access Denied error is occurring before the C# code is even executed. What makes me believe this is that I added one line to the very top of the Program.Main.... File.WriteAllText("C:\\temp\\ws.log", $"Test of Worker Service # {DateTime.Now}. Content Root Path: {AppContext.BaseDirectory}");. My account has full access to the temp folder. This file gets created when I run the app from Visual Studio but it does not get created when I run the app as a service.
I have read numerous web sites, include this one and this one. No luck, everything I tried from these sites still produce the Access Denied error.
I have run out of ideas and am hoping someone here can provide me the answer. Thanks!

I found the solution and believe me I feel really stupid!!!
When I installed it as a service I only put the path in "binPath".
sc create WindowsService1 binPath="C:\temp".
Once I actually added the executable to the binPath parameter everything worked.
Changed it to sc create WindowsService1 binPath="C:\temp\WindowsService.exe" and it worked.
I know it is an Id10t error but Microsoft should really provide better messaging for the "sc" command. A message like "Cannot find file specified in the binPath parameter" would have been really helpful. Would have saved me about 6 hours of work.
Thanks everyone for reviewing and replying to this question.

Windows Service - UnauthorizedAccessException Error when Installing Service (C#)

So I am trying to create a service using C# in Visual Studio 2017 and I keep getting an error when I try to install it.
Right now, I don't even have anything in my service, I just want to be able to install the service. I created a new Project in Visual Studio 2017 using the Windows Service (.NET Framework) template under Visual C# > Windows Desktop. I then added the installer via Right Click > Add Installer. For serviceProcessInstaller1, I set the account to LocalSystem. And...that's it!
Now, I try to install it. I open up command prompt (run as administrator) and I do
InstallUtil ServiceTest.exe
Things start off smoothly, but then I get a message:
"An exception occured during the Install phase.
System.UnauthorizedAccessException: Attempted to perform an
unauthorized operation."
What could be generating this message?
I've googled and tried the following things:
Ensure I run command prompt as administrator.
Assign Full Control to
the project folder to my admin account.
Configure permissions to Full
Control for admin account in the security log of regedit.
Log into my
computer as an administrator (rather than regular user) and run it
that way.
Despite these things, I keep getting the same error. What else could I be doing wrong? Would really appreciate some advice!
Note: I am trying to install this service locally on my computer.
Edit: Per request, here are the logs. I named my project "FailedService", by the way, since I can't get it to work!
InstallUtil.InstallLog
Running a transacted installation.
Beginning the Install phase of the installation.
See the contents of the log file for the C:\Users\first.m.last\source\repos\FailedService\FailedService\bin\Debug\FailedService.exe assembly's progress.
The file is located at C:\Users\first.m.last\source\repos\FailedService\FailedService\bin\Debug\FailedService.InstallLog.
An exception occurred during the Install phase.
System.UnauthorizedAccessException: Attempted to perform an unauthorized operation.
The Rollback phase of the installation is beginning.
See the contents of the log file for the C:\Users\first.m.last\source\repos\FailedService\FailedService\bin\Debug\FailedService.exe assembly's progress.
The file is located at C:\Users\first.m.last\source\repos\FailedService\FailedService\bin\Debug\FailedService.InstallLog.
The Rollback phase completed successfully.
The transacted install has completed.
FailedService.InstallLog
Installing assembly 'C:\Users\first.m.last\source\repos\FailedService\FailedService\bin\Debug\FailedService.exe'.
Affected parameters are:
logtoconsole =
logfile = C:\Users\first.m.last\source\repos\FailedService\FailedService\bin\Debug\FailedService.InstallLog
assemblypath = C:\Users\first.m.last\source\repos\FailedService\FailedService\bin\Debug\FailedService.exe
Installing service Service1...
Creating EventLog source Service1 in log Application...
Rolling back assembly 'C:\Users\first.m.last\source\repos\FailedService\FailedService\bin\Debug\FailedService.exe'.
Affected parameters are:
logtoconsole =
logfile = C:\Users\first.m.last\source\repos\FailedService\FailedService\bin\Debug\FailedService.InstallLog
assemblypath = C:\Users\first.m.last\source\repos\FailedService\FailedService\bin\Debug\FailedService.exe
Restoring event log to previous state for source Service1.

I was FINALLY able to resolve this issue. I was able to get to the bottom of it by using SysInternal's Process Monitor. I opened up the program and had it take logs for InstallUtil.exe. From there, I began to search for any logs that said "Access Denied". As I sorted through them, I noticed something interesting: it was trying to create a registry key, but it kept failing!
So I went into the registry and created a key named "ServiceTest". After that, I ran the InstallUtil command again, and it worked!
If anyone else is having trouble, the solution is to create a key named after your process name in the following location:
HKLM\System\CurrentControlSet\Services\EventLog\Application\

Enter the full path to installUtil & your service binary in an elevated prompt, that could do.

CodedUI and Setup Installer Not Working

I used the CodedUI to record the installation of a product, and tried to replay the recording in visual studio. I'm getting some curious issues and I'm not sure how to work around these.
Message: Test method CodedUITestProject5.CodedUITest1.CodedUITestMethod1 threw exception:
Microsoft.VisualStudio.TestTools.UITest.Extension.FailedToLaunchApplicationException: "The application cannot be started because it cannot be found in the specified location, or the user does not have sufficient permissions to start the application." File: C:\Users\Sakamoto\AppData\Local\Temp\{CF4F5CDB-4597-4C70-BBFD-2687BB031067}\.cr\Setup.exe. Alternative file name: %TMP%\{CF4F5CDB-4597-4C70-BBFD-2687BB031067}\.cr\Setup.exe
The funny thing is the setup file is located on my desktop, and that's where the recording launched it from. Looking in UIMap.Designer.cs, it has to correct path listed in the recorded method right under the Variable Declarations section.
I am also running Visual Studio 2017 as Administrator.
Changing the UIMap.Designer.cs file so that all paths point to the file on the desktop, I get the following error:
Message: Test method CodedUITestProject5.CodedUITest1.CodedUITestMethod1 threw exception:
Microsoft.VisualStudio.TestTools.UITest.Extension.FailedToLaunchApplicationException: "The application cannot be started. This could be due to one of the following reasons:
1) Another instance of the application is already running and only one instance can be running at a time.
2) The application started another process and has now stopped. You may need to launch the process directly.
3) You do not have sufficient privileges for this application." File: C:\Users\Sakamoto\Desktop\Setup.exe.
Can someone help me get an automated run of the setup process going?

C# .Net Service won't install on Win 7 64 bit

.Net 3.5
I've built into the service exe the ability for it to install itself using a -i feature. I have a custom installer class and am using a common technique on found online here. That installer class basically has it's own service and serviced process installer.
This code has worked well for a very long time. Finally ran into a Win 7 64 bit machine were it refuses to install.
Basically, the log shows it's installing the service and that succeeds. Then it tries to create an event log and that fails with
An exception occurred during the Install phase.
System.ComponentModel.Win32Exception: The specified service already
exists
I just got done having the OS completely reinstalled from scratch, first thing I did was try to install as a service, and it's the same error. Why is it thinking that event log is already there?
I've already read all the other posts and I've browsed my registry and there is nothing in there for my service or event log. I have full admin rights, when I try to open cmd as administrator, it doesn't even prompt me, so as far as I can tell, I am an admin (I can see that in my user profile).
I even added code to check to see if it found the EventLog using System.Diagnostics.EventLog.SourceExists which does report it found it, and so I added a call to System.Diagnostics.EventLog.DeleteEventSource but that doesn't help.
I even tried removing the EventLog installer from the ServiceInstaller, but then it starts failing for other reasons.
Any ideas?
Here is some sample code for an alternate installer I tried that I found here with the same results:
public partial class Service1Installer : Installer
{
public Service1Installer()
{
InitializeComponent();
ServiceProcessInstaller process = new ServiceProcessInstaller();
process.Account = ServiceAccount.LocalSystem;
ServiceInstaller serviceAdmin = new ServiceInstaller();
serviceAdmin.StartType = ServiceStartMode.Manual;
serviceAdmin.ServiceName = "Service1";
serviceAdmin.DisplayName = "Service1";
serviceAdmin.Description = "Service1";
Installers.Add(serviceAdmin);
Installers.Add(process );
}
}

uninstall your service
installutil /u yourproject.exe
restart your machine
http://msdn.microsoft.com/en-us/library/sd8zc8ha(v=vs.80).aspx
let me know if you still have a issue

Use installutil as #MicahArmantrout mentions, if the exe still resides on disk.
Otherwise, open a commandline as Administrator and execute: sc delete "my service name"

In the end, my problem was our internal installer. I commented it out and now just install the service from the command line and it now installs on 64 bit OS. Still don't know why it would work before on 32 bit.