I am trying to find the Output : Diagnostics, Displaywarnings file

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@Kyle Benne's answer is good for working in EnergyPlus. In OpenStudio I suggest using the Add Output Diagnostics measure with DisplayAllWarnings selected. This will give you all the diagnostic files you need which will be located in the OSM file directory in the .../run/EnergyPlus folder. The directory and files can also be opened directly from within OpenStudio through the Run Simulation tab > Tree tab

See this answer for directions: https://unmethours.com/question/2271/...

The files you're looking for are the .err and .shd files.

Output:Diagnostics is an idf input object that is used to control what information is included in the eplusout.err file. You can set the first field to "DisplayExtraWarnings" to get extra info in the err file.