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Needless to say, restarting Share Point Designer rarely makes the error go away.The usual advice is: Approach 1: Clear the cache folders See for example How to Clear Your Share Point Designer 2010/2013 Cache.
If it's too late for that, uninstalling and reinstalling Visual Studio seems to fix the problem.
This need for care is especially urgent on Windows, since in general Windows finds programs in the current directory before anything else, regardless of the search path. We have closed many holes, but undoubtedly some remain, especially with third-party programs.
Thus, we recommend checking for suspicious files in the current directory, especially executables (binaries or scripts).
There are no special 64-bit executables for Windows, but the 32-bit executables should run on 64-bit systems.
See section 2.1 for alternate solutions for Windows and Mac OS X.