Well... There appears to be a version conflict: you are probably running a 32bit version of Mongo. Just do as they say and actually use the other default storage engine:
Write the command as follows in your Mongo/bin directory:
mongod --storageEngine=mmapv1 --dbpath [your-path]
Should solve the problem. I guess you don't quite mind about using the good old mmapv1 instead of wiredTiger do you?
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