Which .NET assembly must be selected?

[Andrey_Dmitriev]

In my project .NET was used. Works perfect, but after opening my VI following warning is appear:
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- LabVIEW doesn't have references to the following .NET assebles used by this VI: System, Version=1.0.3300.0, Culture=neutral, PublicToken=b77a5c561934e089
Please add references to those assebles by selecting Tools>>Advanced>>.NET Assembly References before editing this VI.
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My Question is: which assembly (dll) must be selected?
Thank you in advance

[Evan]

Did you add the assembly you are trying to use? To do that you use the Tools>>Advanced>>.NET Assemly References.

In this case I belive it wants the "System" assembly. Did you make or use an assembly named system?

[Andrey_Dmitriev]

.NET was used for getting CPU load in my vi.
The problem that I don't fully understand, which dll must be selected in Tools>>Advanced>>.NET Assemly References.
See attachment "CPU load.vi"
(LV 7.0 + .NET Framework 1.1 from Microsoft)