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Compiler Warning (level 2) CS1668

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Invalid search path 'path' specified in 'path string' -- 'system error message'

The path supplied to /lib at the command line was not valid, or a path in the LIB environment variable is invalid. Check the path used to verify that it exists and can be accessed. The error message in single quotation marks is the error returned from the operating system.

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C# Compiler Errors and Warnings