One-line change. Fixes #2752.
@ -1071,7 +1071,7 @@ const boost::filesystem::path &GetDataDir(bool fNetSpecific)
if (fNetSpecific && GetBoolArg("-testnet", false))
path /= "testnet3";
fs::create_directory(path);
fs::create_directories(path);
fCachedPath[fNetSpecific] = true;
return path;