VS2010 Project - Unresolved Links (Where the HintPath Property Is Missing)

We are now changing our prefabricated computer to a new one and at the same time to Visual Studio 2010. We have about 500 different small components, each of which has its own csproj file, all of which have assembly links to the \\\\\\ directory \\\\\\\\\\\\\\\\

After receiving all the source code and starting compiling our projects, we encountered a problem: many links cannot be resolved, but not all of them, and not always the same links to different projects. The problem seems to be related to the HintPath attribute of the csproj files.

In particular, here is an example of a link in which it can :

<Reference Include="AIS.Common, Version=8.1.0.1, Culture=neutral, processorArchitecture=MSIL">
  <SpecificVersion>False</SpecificVersion>
  <HintPath>..\..\..\Framework\Bin\AIS.Common.dll</HintPath>
</Reference>

And here is one that cannot :

<Reference Include="AIS.ControlLib, Version=9.1.0.1, Culture=neutral, processorArchitecture=MSIL">
  <SpecificVersion>False</SpecificVersion>
</Reference>

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