Fix ‘The method or operation is not implemented Visual Studio’ when referencing project in F# solution

Fix ‘The method or operation is not implemented Visual Studio’ when referencing project in F# solution

Yesterday, when trying to reference a project within my solution, I had an error from VS with the following message.

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The problem was that I was referencing another project which was unloaded.
When expanding the list of references, there is a warning sign for problematic references:

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Most of the time, for me at least, it indicates a mismatch of F# version between the two libraries.
But a mismatch of F# version doesn’t cause the not implemented exception on Visual Studio.
The issue was that the library referenced was unloaded.

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Once I made sure it was loaded, the sign disappeared and VS allowed me to add a reference.

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