Could not load file or assembly 'Oracle.DataAccess' or one of its dependencies error

I have an application that was developed in VS 2010 that was running fine in debug mode on my local machine.

I just had VS 2013 installed and now I get the "Could not load file or assembly 'Oracle.DataAccess' or one of its dependencies" error if I try and debug in VS 2010.  

I get the same error if I try and debug in VS 2013.  

The Oracle.DataAccess.dll file exists in the bin folder of the project and is version 4.112.3.0.  The same file (same version) exists in C:\Windows\Microsoft.Net\assembly\GAC_32\Oracle.DataAccess\v4.0_4.112.3.0_89b483f429c47342.

The VS 2013 install obviously changed something but I don't know what.  Any ideas on how to fix this problem?
dyaroshAsked:
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dyaroshConnect With a Mentor Author Commented:
I discovered the problem.  When I added Oracle.DataAccess as a Reference, the Copy Local flag was set to True.  Setting this value to False resolved the problem.
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Fernando SotoRetiredCommented:
Take a look in the Reference node of Solution Explorer and see if any of the dll's have an informational icon next to the offending dll. If there is then place your cursor on it and right click and remove it. The add the dll back in by adding a reference to the project.
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dyaroshAuthor Commented:
None of the DLLs in Reference have an information icon next to them.
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Fernando SotoRetiredCommented:
You state, "I just had VS 2013 installed and now I get the "Could not load file or assembly 'Oracle.DataAccess' or one of its dependencies" error if I try and debug in VS 2010.", so are you saying that it no longer is working in VS 2010 as well as VS2013?
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dyaroshAuthor Commented:
That is correct.  I cannot debug under VS 2010 or VS 2013.  If I deploy my application to a web server, the application runs without any errors.
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Fernando SotoRetiredCommented:
Well then I am at a lost seeming installing VS 2013 will not interfere with other VS install, they all can coexist.

When you opened the project in VS 2013 did it go through a upgrade process? if it did, did it have any errors? Are you opening this upgraded project in VS 2010?
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dyaroshAuthor Commented:
The project did not go through an upgrade process when opened in VS 2013.  I am able to open the project in VS 2010 and VS 2013.
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Fernando SotoRetiredCommented:
Do you have a copy of the project like in Version Control that was not open in VS 2013 and try to run that in VS 2010.
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dyaroshAuthor Commented:
I did that and I still get the same error.  I think the problem is with Oracle Data Access Components.  It looks like I may now have two versions of that on my machine.  I am going to try and uninstall the newer version and see if that solves my problem.
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dyaroshAuthor Commented:
I uninstalled both versions of the Oracle Data Access Components and reinstalled the version that was there before the VS 2013 install.  Still no luck.  I get the same error message.

I will be away for the next 5 days and will check back when I am back in the office.
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dyaroshAuthor Commented:
I discovered the answer on my own.
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