VB.net Excel Add-in An Add-in cannot be loaded


I have developed a number of Excel 2007 Add-ins in Visual Studio
After a few years of development I am suddenly getting an error
"An Add-in cannot be loaded" and the add-in that I am working
won't run in Excel.

I am not sure why this is happening.
I have only developed Excel 2007 Add-ins and last night started an Excel 2010 Add-in
I don't know if this has perhaps caused a conflict of sorts or if I just have too many add-ins

Either way this is a dire situation.....
Murray BrownMicrosoft Cloud Azure/Excel Solution DeveloperAsked:
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It is pointing to Ribbon1.vb line 5 as the line of code causing the error. What is the code on that line?

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